Judul: The marketing system of rubber smallholders in Jambi Province with Structure, Conduct, Performance (SCP) Approachment
Abstrak: Rubber is the main commodity from Jambi Province. Most (80%) of rubber plantation is smallholders plantation. Most (95%) of rubber production is exported to the world market. In the rubber market, increased price at exporters level is not followed by farmers level. However, the high price of rubber at the world level has not been transmitted by the rubber farmers in Jambi Province. It is shown from the volatility of rubber prices during the year 2008 to the year 2013, the increase in the price level of crumb rubber factory (exporters) are large enough not followed by an increase in the price of farm level. The fundamental problem for majority of rubber farmers in Jambi Province is weak bargaining position of farmers in the pricing process. Market condition will affect the behavior of a marketing agency and the determination of price. However, how to respond and how fast the price changes which are responded by marketing agencies will be identified through analysis of market performance. Based on these problems, it is necessary to smallholder rubber marketing system analysis approach to structure, conduct, performace (SCP). The aims of this study are to 1) analyze the market structure of rubber smallholders in Jambi Province, 2) describe the market conduct of rubber smallholders in Jambi Province, 3) analyze the market performance of rubber smallholders in Jambi Province. The analysis used are the descriptive and quantitative analysis of SCP approachment. Quantitative data processing use software Microsoft Excel 2007 and Eviews 6. The analysis showed that the market structure that faced by rubber farmers in Jambi Province is oligopsonistic. This is caused the market condition at the exporters level was concentrated with a small level of competition (CR4 = 75.70 %). The amount of market power possessed crumb rubber plant will affect the behavior of a marketing agency in the lower level shown in the behavior of the market (market conduct). Institution and practices of marketing function involved are farmers, village collectors, subdistrict collectors, province trader, rubber auction market and crumb rubber factory (exporters). The marketing function is exchange function, physical function and facilities function. Rubber marketing channel in Jambi Province consist of 5 channels. The first channel is farmer-rubber auction market-crumb rubber factory (exporters). The second is farmer-village collectorrubber auction market-crumb rubber factory (exporters). The third is farmervillage collector-province trader-crumb rubber factory (exporters). The fourth is farmer-sub district collector-province trader-crumb rubber factory (exporters) and the fifth channel is farmer-crumb rubber factory (exporters). Dependence of farmers on the collector due to the limmitations of the farmer in gainning access to market information and financial source. This causes weak bargaining position of farmers in the pricing process. Conditions of oligopsony market structure is faced by farmers and the weak bargaining position of farmers in pricing process will affect the performance of the market. It it proved by the share price of rubber received by farmer still low (< 60%) with relatively high margin. This condition is caused by dependence of farmers to collector and limited facilities and infrastructure owned by farmers with the result that all of farmers
Keyword: marketing system, rubber smallholders, market structure, market conduct, market performance, the price

Judul: Marketing Efficiency and Choice of Rubber Marketing Channels in Ogan Ilir Regency South Sumatra
Abstrak: Komoditas karet di Kabupaten Ogan Ilir berperan penting dalam meningkatan pendapatan keluarga, tetapi saat ini pendapatan petani karet masih tergolong rendah karena pemasaran karetnya masih bersifat tradisional, sehingga menyebabkan harga yang diterima petani menjadi rendah. Tujuan penelitian ini adalah untuk menganalisis efisiensi pemasaran dan faktor-faktor apa saja yang memengaruhi petani dalam memilih saluran pemasaran, apakah proses pemasaran karet yang dilakukan menguntungkan bagi petani atau sebaliknya dan diharapkan petani mampu memilih saluran yang menguntungkan. Data yang digunakan berupa data primer dan data sekunder. Pengambilan sampel dilakukan secara acak. 75 sampel digunakan dalam penelitian ini, dengan populasi petani karet yaitu 236 petani di Kecamatan Tanjung Batu dan 254 di Kecamatan Payaraman yang dipilih secara purposive. Pengumpulan data menggunakan data panel dengan tiga periode waktu (3 minggu) atau tiga kali penjualan. Efisiensi pemasaran karet dianalisis dengan marjin pemasaran, farmer’s share, dan rasio keuntungan terhadap biaya dan model Data Envelopment Analysis (DEA). Untuk pilihan saluran pemasaran menggunakan analisis panel multinomial logit regression degan menggunakan Software statistik STATA 17. Hasil penelitian menunjukkan petani karet di Kabupaten Ogan Ilir menggunakan tiga pola saluran pemasaran., Rubber agribusiness plays an important role in national development. South Sumatra is the largest rubber producing region in Indonesia, namely 870,966 tons in 2021. Ogan Ilir Regency is one of the regions that contributes quite a large amount of rubber production in South Sumatra with total production of 33,520 tons with a total of 18,919 farmers in 2021. Most of them Farmers sell rubber to collectors because of low production, long distance from production sites and factories, and inadequate transportation. The aim of this research is to identify the condition of the channels and functions of rubber marketing institutions, analyze the efficiency of rubber marketing and analyze the factors that influence the selection of rubber marketing channels in Ogan Ilir Regency. This analysis is used to identify the efficiency of marketing institutions and marketing functions in each institution involved in each marketing channel in Ogan Ilir Regency. Marketing function analysis aims to determine the activities and respective roles of marketing institutions. Apart from that, quantitative analysis is also used in this research to analyze rubber marketing efficiency, namely marketing margin, farmer's share, and profit to cost ratio at each marketing institution. Marketing channels are formed due to the activities of marketing institutions from producers to consumers. To find out which channels are the most efficient and what variables need to be improved to achieve efficiency, you can use Data Envelopment Analysis (DEA) and to see what factors influence choosing marketing channels by using the Model Fit Test (Goodness of Fit), Parameter Testing, Wald Test, Meanwhile, to see what factors influence farmers in choosing rubber marketing channels, namely by looking for the RRR (relative risk ratio) value
Keyword: efisiensi pemasaran, saluran pemasaran

Judul: igenvalues and Eigenvectors of Tridiagonal Matrix with Non Constant and Recurrent Diagonal Entries.
Abstrak: Matriks tridiagonal adalah suatu matriks yang mempunyai entri-entri bernilai nol kecuali pada diagonal utama, di bawah diagonal utama (subdiagonal) dan di atas diagonal utama (superdiagonal). Entri pada diagonal utama tidak konstan dan berulang. Setiap entri pada matriks tridiagonal ini adalah bilangan kompleks. Dalam karya ilmiah ini, akan dibuktikan 3 teorema untuk menentukan nilai eigen dengan 2 kasus dan 1 teorema untuk menentukan vektor eigen. Teorema pertama menentukan polinomial karakteristik dari matriks tridiagonal. Polinomial karakteristik dari matriks tridiagonal tersebut digunakan untuk menentukan nilai eigen pada teorema kedua dan ketiga serta menentukan vektor eigen pada teorema keempat
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