# Price Risk Control of Natural Resource Commodities through Behavioral Finance Analysis: An Information Transfer Perspective

Authors: Zehui Liu
Journal: Discrete Dynamics in Nature and Society
 (2022)

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## Abstract

To fully understand the market price volatility mechanism of natural resource commodities (NRCs), and control the price risks of NRCs, it is important to deeply analyze how NRC price is affected by uncertain risk factors, such as supply risk, demand risk, macroscopic price risk, political price risk, policy price risk, seasonal price risk, and sudden price risks. The theory of behavioral finance can establish a transaction decision-making model more in line with the actual market situation. Therefore, this paper explores the price risk control of NRCs from the perspective of financial theories. Firstly, the authors empirically examined the specific impacts of uncertain risk factors on NRC price, and the directions of the impacts. Next, the price volatility and transaction risks of NRCs brought by information transmission were analyzed, following by the construction of an information transmission model for NRC trading market. After that, a dynamic price model was built for NRCs based on the theory of behavioral finance. Finally, the effectiveness of the proposed model was verified through experiments.


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## Body

## 1. Introduction

In the age of economic globalization, countries across the world are striving to develop their economy, and therefore demanding more international natural resources [1–7]. Hence, the price volatility of natural resource commodities (NRCs) has a great impact on global economic development and national stability [8–13]. With the emergence of sudden incidents like financial crisis, national debt crisis, and trade friction, uncertain financial risks are on the rise [14–19]. In-depth research on how to define and quantify the effects of uncertain risk factors on NRC price would help to fully understand the price volatility mechanism of NRCs, and facilitate the policymaking of controlling NRC price volatility.The price dynamics of the energy futures market is an important factor affecting the global economy, such as crude oil futures, gold futures and agricultural product futures. Wang et al. [20] introduced a new stochastic interactive energy futures price model to simulate the price dynamic mechanism of that market, and studied the price volatility and c fluctuation dynamics of the model with two statistics: daily logarithmic yield, and volatility duration average intensity (VDAI). Through complementary ensemble empirical mode decomposition (CEEMD), Chen and Pan [21] divided the Chinese stock index futures price series into residual items, low-frequency items, and high-frequency items, revealing the volatility of the series on different time scales, and predicted the Chinese stock index futures price by combining the decomposition method with the support vector machine (SVM) based on particle swarm optimization (PSO). Wang et al. [22] analyzed the fractal features of International Energy Exchange (INE) crude oil market through rescaled range (R/S) analysis, multifractal detrended fluctuation analysis, and multifractal spectrum analysis. The results show that the price yield of INE crude oil carries significant multifractal features. Ames et al. [23] introduced the regression structure to expand the multi-factor random model of the structural dynamics of commodity futures price period, and discovered that the expanded model helps to explain the main observable factors of the structure of commodity futures price period (e.g., dollar index, inventory, and commodity index) and facilitates the risk avoidance by financial intermediaries. Weron [24] proposed a jumping-diffusion model, which restores the main features of the power spot price in the Nordic market, including seasonality, mean regression, and spikes. Kakeu and Bouaddi [25] empirically demonstrated the correlation between the long-term risks impacted by uncertainty, and the future growth prospects, and integrated dynamic factor analysis into an econometric approach to estimate the pricing equation of oil inventory. Sadorsky [26] developed a model to estimate the conditional expected return of oil futures price under time-varying risks, and empirically proved the strong predictive power of macroeconomic risk factors for the oil futures market. Korotayev et al. [27] evaluated the social-political instability risks of oil exporters that might be induced by oil price decline, and analyzed the relationship between oil price changes and political crises in economies.Based on behavioral financial theory, it is possible to establish a transaction decision-making model reflecting the actual market situation of the natural resources like crude oil futures, gold futures, and agricultural product futures. The model can replace the traditional mathematical method and questionnaire survey to study the price volatility features of natural resources. Meanwhile, the existing studies have not included the uncertainty of risk factors to the research of the factors affecting NRC price, but carry on with the traditional price impact mechanism. Therefore, this paper decides to explore the price risk control of NRCs from the perspective of financial theories. Section2 empirically examines the specific impacts of uncertain risk factors on NRC price, and the directions of the impacts; Section 3 discusses the price volatility and transaction risks of NRCs brought by information transmission, and constructs an information transmission model for NRC trading market; Section 4 builds up a dynamic price model for NRCs based on the theory of behavioral finance. The effectiveness of the proposed model was verified through experiments, and the relevant results were analyzed.


## 2. Influence of Risk Factors on NRC Price

Empirical method is needed to reveal the impacts of uncertain risk factors on NRC price, and the directions of the impacts. This paper chooses the vector autoregression (VAR) model with time-varying parameters to analyze the effects of risk factors on NRC price, aiming to describe the time dynamics of model parameters.Letr be the lag period of tradable NRCs; φ be time; bφ be an l∗1 vector composed of l observable variables; X, G1, …, Gr be an l∗l coefficient matrix; ζφ be an l∗1 structural impact. Then, the basic VAR model can be constructed:(1)Xbϕ=G1bϕ−1+Grbr−ϕ+ζϕ,ϕ=r+1,...,m.This paper divides the NRC market allowing free contract transactions into agricultural product market (APM), energy market (EM), and non-ferrous metal market (NFMM). From each of the three markets, three representative commodities with high trade volumes were selected to study the impact mechanism of uncertain risk factors on the core commodity prices in these markets. The three commodities from each market correspond to three vectors. The three vectors plus a risk factor make the number of variables 4, i.e.,l = 4.The three commodities from APM are soybean, wheat, and cotton. The corresponding three variables are the price to earnings (P/E) ratios of soybean, wheat, and cotton, denoted asYRSO, YRWH, add YRCOT, and the corresponding uncertain risk factor is denoted as URFAPM. The three commodities from EM are crude oil, natural gas, and coal. The corresponding three variables are the P/E ratios of crude oil, natural gas, and coal, denoted as YRCR, YRGA, and YRCOA, and the corresponding uncertain risk factor is denoted as URFEM. The three commodities from NFMM are gold, silver, and cooper. The corresponding three variables are the P/E ratios of gold, silver, and cooper, denoted as YRGO, YRSI, and YRCOP. The corresponding uncertain risk factor is denoted as URFNFMM.Letε be standard deviation. The structural impact ζφ satisfies ζφ∼M(0, Φ), where(2)Φ=ε10000ε20000ε30000ε4.Suppose coefficient matrixX is a lower triangular matrix (3), in which all the elements on the main diagonal are 1(3)X=1000x21100x31x3210x41x42x431.Letρφ be the residual item; Jr be the unit matrix; μi = X−1Gi, i = 1, 2, …, r. In this case, the model is a recursive structural VAR model. Then, formula (1) can be converted into(4)bϕ=μ1bϕ−1+μ2bϕ−2+...+μrbϕ−r+Ψ−1δρϕ,ρϕ∼M0,Jl.The elements in each row of matrixμi need to be processed to convert the matrix into the form of a 16r × 1-order vector α. Let us define Aφ = Jr○(b'φ−1, …, b'φ−r), with ○ being the Kronecker product. Then, formula (4) can be further transformed into(5)bϕ=Aϕα+Ψϕ−1δϕρϕ,where α is not a time-varying parameter. To analyze the effects of uncertain risk factors on NRC price, it is necessary to build up a VAR model with time-varying parameters:(6)bϕ=Aϕαϕ+Ψϕ−1δϕρϕ,ϕ=r+1,...,m,where αφ, Ψφ, and δφ are all time-varying parameters. Since the determinant of time-varying parameter matrices is nonzero, the matrices are all reversible. Let x1 = (x21, x31, x32, x41, …, x4x3)′ be the lower triangular elements of conversion matrix S; fφ=(f1φ, f2φ, f3φ, f4φ)′且flφ = Lnε2jφ, j = 1, 2, 3, 4, φ = r + 1, …, m be the logarithmic random fluctuation matrix. If formula (6) obeys the random walk, then(7)αϕ+1=αϕ+ζαϕυϕ+1=υϕ+ζυϕfϕ+1=fϕ+ζfϕ,ρϕζαϕζυϕζfϕ∼M0,J0000δα0000δυ0000δf,where, υr+1∼M(ζυ0, δυ0); βr+1∼M(ζβ0, δβ0); hr+1∼M(ζh0, δh0). Then, the parameters can be estimated more accurately based on the Markov chain Monte-Carlo (MCMC) method.


## 3. Information Transmission Model of NRC Transaction Market

The NRC market is featured by a large scale, advanced transaction techniques, and a complex group of traders. Drawing on behavioral finance theories, the following can be discovered from the behavioral patterns of different traders: during free contract transactions, the traders of different information acquisition channels, knowledge backgrounds, and energies exhibit different behavioral features. Independent traders with strong abilities and energy only spend the information cost on holding commodities or commodity mix, facing a high holding risk. Since the independent traders dominate the NRC market, this paper takes them as the main objects, and discusses the price volatility and transaction risks of NRCs brought by information transmission, in the light of these traders’ decision-making of transaction behaviors.Let (Γ,G, O) be a probability space; Y2 be the ε-algebraic in the Borel set of the two-dimensional (2D) real number space E2; LEB(.) be the Lebesgue measure of E2; X ∈ Y2 be a bounded Borel set; l be an integer. If A satisfies formula (8) for any l, then A is a Poisson point process with intensity χ:(8)OAX=l=χlLEBXll!h−χkX.The distribution of independent traders in the market is assumed to be the point set generated by a Poisson point process with intensityχ in space E2, and denoted as {Ai|i ∈ J}. The influence range of each independent trader Ai is considered as a 2D sphere with Ai as the center and ei as the radius, and denoted as Ri. Seepage only occurs when the two spheres Ri and Rj intersect (Figure 1).Figure 1
Schematic diagram of continuous seepage.Taking a particular commodity in the NRC market as an example. LetR(φ) be the commodity price at time φ. With the elapse of time, R(φ) constitutes the change process of commodity price. The gain process ΔE(φ) in all periods φ = 1, 2, …, ψ can be expressed as(9)ΔEϕ=ΔRϕRϕ−1,whenRϕ−1>0,0,whenRϕ−1=0,where ΔR(φ) = R(φ) − R(φ − 1)}. Suppose each independent trader holds a certain number of NRCs, and does not change the commodity mix. That is, the trader only cares about the price R(φ) of his/her NRCs.The price hike/decline of NRCs is mainly driven by the transaction difference produced by the long-short trading decision-making of NRCs by independent traders in different seepage strings. LetDi(φ) be the NRC transaction strategy adopted by the independent traders in the i-th seepage string; |ωi(φ)| be the actual number of NRCs being traded by independent traders in seepage string Di(φ) at time φ due to the transactions of people in their surroundings. Then, the earnings process ΔE(φ) at time φ can be expressed as(10)ΔEϕ=τ∑i≥1sgnDiϕωiϕ,where τ is a positive constant. The seepage string Di(φ) satisfies,(11)sgnDiϕ=1,Diϕis a buy−in string,0,Diϕis a waiting−an  d−see string,−1,Diϕis a sell−out string.The above derivation completes the definition of ΔE(φ). Considering relationship between NRC price index and ΔE(φ), the NRC price at time φ can be obtained through compound interest method:(12)Rϕ=R0∏t=1ϕ1+ΔEϕ.By analyzing the transaction information transmission mechanism, it is possible to obtain the law of NRC price volatility influenced by information transmission. During the price changeR(φ) of NRCs, many empirical parameters of behavioral finance are involved. The relative important parameters include the bottom and the top of commodity price. This paper discusses the influence of the two parameters through empirical analysis.Based on the continuous seepage theory, the intensity of the critical Poisson point process that is strong enough to induce a seepage between points is denoted asχ. The critical probability of the seepage can be defined as the probability GVd of satisfying the corresponding attributes. Let GVv and GVc be the buy-in and sell-out probabilities of the transaction information transmission in the seepage string, respectively. Relative to critical probability GVd, GVv and GVc satisfy(13)GVvRmin∗=GVdGVcRmax∗=GVd,where R∗min and R∗max are the top and bottom NRC prices under the above conditions, respectively. Different from Rmin and Rmax, R∗min and R∗max are the critical values of NRC price, and estimated based on the frequently occurred probabilities. In the actual NRC market, when the commodity price fluctuates greatly, a rational trader would choose buy-in at R < R∗min, and choose sell-out at R > R∗min, aiming to eliminate the NRC market overshoot induced by sudden occurrence of non-systematic risks. R∗min and R∗max can be expressed as(14)Rmin∗=Rmin+−1ξlnGVdRmax∗=Rmax+−1ηlnGVd.Formula (14) shows that the top and bottom of NRC price can be estimated by determining empirical parameters ξ and η. The relationship between these two empirical parameters can be expressed as(15)η=ξR¯−Rmin2R¯−Rmax2.


## 4. Dynamic Price Model Based on Behavioral Finance Theory

Following traditional finance theory, all models for the NRC market are equilibrium models. Unlike traditional finance, behavioral finance views the mentality of traders differently. The logic of behavioral finance is the reverse of that of traditional economics. The traditional economics theory firstly creates ideals, and then moves gradually towards reality, focusing on what should happen under ideal conditions. In contrast, behavioral finance focuses on experience and its underlying reasons.Figure2 compares the differences between traditional finance and behavioral finance. Based on behavioral finance theory, this paper summarizes the research objects as independent traders, group behavior of traders, ineffective market, and effective market.Figure 2
Differences between traditional finance and behavioral finance.The buy-in/sell-out decision-making of independent traders in the window [ψφ,ψφ+l] of a transaction is apparently a static game in a unit period. The price of the commodity mix at time φ can be denoted by Oφ.Figure3 shows the response of commodity price to different types of information. It can be inferred that bear information transmission impacts the market more significantly than bull information transmission.Figure 3
Response of commodity price to different types of information.When information is being transmitted in the market, the number of people that underreact to the transaction information, and that of the people that overreact are denoted asM1 and M2, respectively. Then, the proportion of underreacting people can be calculated by(16)λϕ=M1M1+M2.Correspondingly, the overreacting traders areθφ = 1 − λφ. The NRC market is normally ineffective. Excluding the value of NRCs, the volatility of transaction price is essentially a game between traders possessing different types of transaction information. Therefore, the actual price of natural resources can be expressed as the competition between the decision-making of two kinds of traders. The actual price Oφ of commodity mix can be expressed as:(17)Oϕ=λϕOϕ1+1−λϕOϕ2,Oϕ=λϕgϕ+1−λϕwϕ.Ifλφ = 0, then Oφ = w(φ). In this case, all the traders in the market overreact to the transaction information; If λφ = 1, then Oφ =  g(φ). In this case, all the traders in the market underreact to the transaction information. The proportions of the two types of traders jointly shape the investment sentiment in the market. Figure 4 presents the game intervals of transactors of different transaction information. The x-axis is time, and the y-axis is commodity price.Figure 4
Game intervals of traders with different types of transaction information.To build a more realistic dynamic NRC price model, this paper introduces the other investment features of traders to the proposed static price model. The actual rate of yield of NRCs can be calculated by(18)Eϕ=Oϕ−Oϕ−1Oϕ−1.If the expected price of NRCsH(Eφ+1) > Eφ, i.e., the expected rate of yield of NRCs in φ + 1 is greater than that in φ, then the traders would choose buy-in; if H(Eφ+1) < Eφ, i.e., the expected rate of yield of NRCs in φ + 1 is smaller than that in φ, then the traders would choose sell-out.If the actual expectation of NRCs consistently surpasses the expected rate of rate of traders, as shown in formula (19), then φ > j > m > 0. In this case, the traders would be confident with the selected NRC mix and the buy-in behavior, and more likely to choose buy-in again.(19)HEϕ+1|HEϕ>Eϕ,HEϕ−1>Eϕ−1,...,HEϕ−j>Eϕ−j>HEϕ+1|HEϕ>Eϕ,HEϕ−1>Eϕ−1,...,HEϕ−m>Eϕ−m.If the actual expectation of NRCs consistently trails the expected rate of rate of traders, as shown in formula (20), then φ > j > m > 0. In this case, the traders would be unconfident with the selected NRC mix and the buy-in behavior, and more likely to choose sell-out(20)HEϕ+1|HEϕ<Eϕ,HEϕ−1<Eϕ−1,...,HEϕ−j<Eϕ−j<HEϕ+1|HEϕ<Eϕ,HEϕ−1<Eϕ−1,...,HEϕ−m<Eϕ−m.According to our hypothesis, whenEφ−1 is known, the underreacting traders expect the rate of return in φ to be H(E1φ) < Eφ−1, and the overreacting ones expect the rate of return in that period to be H(E2φ) > Eφ−1. Table 1 summarizes the behaviors of different types of traders.Table 1
Behaviors of different types of traders.
Type of tradersConditionEventBehaviorUnderreacting tradersωφ1Eφ<Eφ−1H(Eφ+11) < Eφωφ2Eφ>Eφ−1E(Eφ+11) > Eφ or E(Eφ+11) < EφOverreacting tradersωφ1Eφ<Eφ−1H(Eφ+11) > Eφ or H(Eφ+11) < Eφωφ2Eφ>Eφ−1H(Eφ+11) < EφIf the commodity price fluctuates oppositely to trader’s expectation, the traders with different expectations will shift their positions. LetGV(ωφi) be the occurrence probability of a transfer event; GV(x(θφ-1)|ωφi) be the transfer probability of condition i after the event. Then, the proportion of the two types of traders can be expressed as(21)λϕ=λϕ−1+θϕ−1GVλθϕ−1|ωϕ1GVωϕ1−λϕ−1GVθλϕ−1|ωϕ2GVωϕ2,θϕ=θϕ−1−θϕ−1GVλθϕ−1|ωϕ1GVωϕ1+λϕ−1GVθλϕ−1|ωϕ2GVωϕ2,whereλϕ+θϕ=1.Then,GV(ωφi) depends on the proportion of independent traders in the market:(22)GVωϕ1=λϕ−1,GVωϕ2=θϕ−1,Combining formulas (21) and (22)(23)λϕ=λϕ−1+θϕ−1GVλθϕ−1|ωϕ1λϕ−1−λϕ−1GVθλϕ−1|ωϕ2θϕ−1,θϕ=θϕ−1−θϕ−1GVλθϕ−1|ωϕ1λϕ−1+λϕ−1GVθλϕ−1|ωϕ2θϕ−1,Substitutingθφ-1 = 1 − λφ−1 into formula (23)(24)λϕ=Δ1λϕ−12+1−Δ1λϕ−1,θϕ=−Δ1θϕ−12+1−Δ1θϕ−1,(25)Δi=GVθλϕ−i∣ωϕ2−GVλθϕ−1∣ωϕ1,where GV(θ(λφ-1)∣ωφ2) actually means the price hike of NRCs make traders to expect earnings, and reduce the number of underreacting traders/increase the number of overreacting traders, i.e., the emotional disposition exists in the market; GV(λ(θφ-1) |ωφ2) actually means the price fall of NRCs make traders unconfident with their commodities, and increase the number of underreacting traders/reduce the number of overreacting traders, i.e., the casual attribution exists in the market.Formula (25) can be extended into(26)λϕ=λϕ−1+θϕ−1∑ϕ=1lGVλθϕ−i|ωϕ+1−i1GVωϕ+1−i1−λϕ−1∑ϕ=1lGVθλϕ−i|ωϕ+1−i2GVωϕ+1−i2,θϕ=θϕ−1−θϕ−1∑ϕ=1lGVλθϕ−i|ωϕ+1−i1GVωϕ+1−i1+λϕ−1∑ϕ=1lGVθλϕ−i|ωϕ+1−i2GVωϕ+1−i2,Similarly(27)λϕ=λϕ−1∑i=1lΔiλϕ−i+1−∑i=1lΔiλϕ−i,θϕ=−θϕ−1∑i=1lΔiθϕ−i+1−∑i=1lΔiθϕ−i,(28)ΔGVi=GVθλϕ−i∣ωϕ+1−i2−GVλθϕ−i∣ωϕ+1−i1,where ΔGV is the transfer probability difference between a market of emotional disposition and a market of casual attribution. Combined with the previous analysis results, the proportions of different types of traders change dynamically from the initial moment ψ0, as the commodity rate of return varies from period to period. In other words, λφ is a function λφ(φ) of time φ. Let λ0 be the λφ at the initial moment. Then, the NRC price mechanism function of the dynamic model can be expressed as(29)GV1=λ0GV01+1−λ0GV02,=λ0g0+1−λ0w0,=λ0σ1ψ1+1−λ0σ2ψ2+λ0ρ01+1−λ0ρ02,λ0∈0,1,whereas λ0 = Ω(λ0, Y0), period φ satisfies(30)βϕ=ΩXϕ,Yϕ,GVϕ+1=λϕGVϕ1+1−λϕGVϕ2,=λϕgϕ+1−λϕwϕ+λ1ρ1ρ+1−λϕρϕ2,λϕ∈0,1,ρϕ1,ρϕ2∼λϕ.Therefore, as transaction information propagates in the market, all traders would judge the commodity value based on historical information and psychological behaviors. Then, the traders whose expected price is above the actual price would enter a price game in the market with those whose expected price is below the actual price. The proportions of the two types of traders would change continuously until the actual price reaches their target price.


## 5. Experiments and Result Analysis

Since the traders would the commodity value based on historical information and psychological behaviors, this paper assigns greater weights to more recent transaction information and psychological behaviors. Figure5 compares the incomes of different NRC markets. It can be seen that the exponential weight is strongly correlated with the rate of return of commodities. In most cases, the correlation is positive, but difficult to quantify.Figure 5
Comparison of the incomes of different NRC markets.To verify the income of our model, this paper constructs a short-term transaction strategy of traders. Firstly, a stop loss line was set up to prevent heavy losses based on the support and resistance levels. When the composite index becomes positive twice in a row, the traders choose buy-in; when that index becomes negative twice in a row, the traders choose sell-out. Figure6 compares the income of our model with that of the short-term transaction strategy. It can be observed that our model could effectively avoid the price decline of the overall market. The comprehensive rate of return was -16.75% for the overall market. The rates of return for short-term transaction strategies were simulated as 17.54%, 8.51%, and 7.33%, all falling in the ideal range.Figure 6
Income comparison against short-term transaction strategy.The parameter estimations of APM, EM, and NFMM obtained by MCMC are displayed in Tables2–4, respectively, including the posterior mean, standard deviation, CD, invalidity factor, 95% confidence interval, etc. The data in the tables only cover the estimations for the first diagonal elements in matrices ks, kr, and ku. Judging by the CD values, the null hypothesis that the estimated parameters converge to its posterior distribution remains valid, even at the significance level of 1%. Since the MCMC sampling was conducted for more than 10,000 times, the maximum invalidity factors in the tables were relatively small. The largest value was merely 74.35. That is, at least 133 uncorrelated samples could be obtained. It can also be learned that the selected MCMC method effectively estimated all the parameters, and the proposed model achieved a high goodness-of-fit.Table 2
Parameter estimation of APM.
Parametersksks'krkr'kuku'Mean0.02340.02360.04570.04340.62340.3768Standard deviation0.00260.00270.00890.00760.11340.0975Confidence distribution (CD)0.5720.3950.3320.6740.8030.762Invalidity factor10.369.5423.6227.9437.6970.4895% confidence interval[0.0189 0.0236][0.0189 0.0276][0.0324 0.0675][0.0234 0.0562][0.04125 0.8679][0.2354 0.6138]Table 3
Parameter estimation of EM.
Parametersksks'krkr'kuku'Mean0.02360.02340.05370.05420.57530.3739Standard deviation0.00240.00240.01460.01340.12490.0976CD0.2760.5630.6740.1620.4580.027Invalidity factor8.6311.3638.6548.3556.7674.3595% confidence interval[0.0139 0.276][0.0186 0.0287][0.0367 0.0851][0.0324 0.0889][0.3742 0.8641][0.2374 0.6126]Table 4
Parameter estimation of NFMM.
Parameterssb1sb2sa1sa2sh1sh2Mean0.02360.02450.03750.03760.62750.3945Standard deviation0.00260.00270.00590.00530.12360.0854CD0.0030.3240.1590.5230.2540.426Invalidity factor11.2613.6217.5926.3442.3841.4295% confidence interval[0.0196 0.0275][0.0194 0.0236][0.0274 0.0458][0.0265 0.0489][0.4231 0.8672][0.2752 0.5638]Figures7–9 present the curves for the time-varying features of stochastic price volatility for commodities in APM, EM, and NFMM, respectively. Under the influence of uncertain risk factors, the prices of APM and NFMM commodities fluctuated similarly: both of them increased with fluctuations in 2014–2016, and dropped with fluctuations from the end of 2016 to the start of 2017. Compared with that of EM and NFMM, the commodity price of APM was weakly impacted by uncertain risk factors through the study period. The APM commodity price volatility reached the peak near 2013, mainly due to the decline in the output of agricultural products across the market, which is driven by droughts.Figure 7
Time-varying features of stochastic price volatility for APM commodities.Figure 8
Time-varying features of stochastic price volatility for EM commodities.Figure 9
Time-varying features of stochastic price volatility for NFMM commodities.Figure10 reports the time-varying features of stochastic price volatility of commodity price under the impact of economic policy risks. It can be seen that the economic policy risks had 3-4 clear peaks near 2013-2014, 2017-2018, and 2019-2020. In the real world, the European debt crisis occurred in 2013-2014, Brexit happened in 2016-2017, and COVID-19 broke out and spread in 2019-2021. These sudden events significantly push up the uncertainty of economic policies, bringing the peaks of economic policy risks. To sum up, the stochastic volatility features of the uncertain risks induced by real-world events correspond well with those of commodity price. For example, the COVID-19 epidemic brings unprecedented impacts on the oil futures price in the international market. In the short term, it is suggested mitigating the price volatility risks by adding bonds. In the long run, it is suggested focusing on the variation of domestic interest level.Figure 10
Time-varying features of stochastic price volatility of commodity price under the impact of economic policy risks.Therefore, our model fits well with the time-varying features of actual volatilities, which demonstrates the feasibility and effectiveness of the model.


## 6. Conclusions

This paper explores the risk control strategies for NRC commodity price from the angle of financial theory and constructs the relevant model to analyze the risk control. The authors investigated how NRC price is impacted by uncertain risk factors, such as supply risk, demand risk, macroscopic price risk, political price risk, policy price risk, seasonal price risk, and sudden price risks, and what are the directions of the impacts. After that, an information transmission model as created for NRC trading market, and a dynamic price model was developed for NRCs based on the theory of behavioral finance. Through experiments, the authors compared the incomes of different NRC markets, and the income of our model with that of short-term transaction strategy. The comparison shows that our model could effectively avoid the price decline of the overall market. It was concluded that the energy market price fluctuates similarly to the nonferrous metal market price, under the effects of uncertain risks. The results confirm that our model fits well with the time-varying features of actual volatilities, which demonstrates the feasibility and effectiveness of the model.



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*Source: 5236903-2022-03-30.xml*