Judul: Dampak Intervensi Pasar Terhadap Volatilitas Harga Beras di Tingkat Konsumen
Abstrak: Fluktuatif harga beras menjadi permasalahan di Indonesia dimana jumlah produksi dan konsumsi beras yang tidak seimbang penyebab ketidakseimbangan perekonomian masyarakat. Indonesia menjadi negara berkembang yang memiliki pendapatan per kapita rendah sehingga intervensi pemerintah mampu mengurangi ancaman kelaparan dan rawan pangan jika dilakukan dengan tepat. HET, HPP, Stabilisasi Pasokan dan Harga Pangan (SPHP) Beras dan penyaluran Bantuan Pangan menjadi beberapa kebijakan yang dilakukan pemerintah untuk menjaga stabilitas dan kepastian harga. Oleh karena itu, untuk mengetahui pengaruh kebijakan intervensi pasar terhadap volatilitas harga beras di tingkat konsumen dilakukan penelitian ini. Penelitian ini menggunakan metode analisis regresi data panel dan Coefficient of Variation (CV). Hasil penelitian yang telah dilakukan didapatkan bahwa intervensi pasar secara simultan berpenagruh signifikan terhadap volatilitas harga beras tingkat konsumen. Sedangkan pada uji t menunjukkan bahwa hanya variabel volatilitas harga beras di tingkat pedagang besar dan produsen yang berpengaruh signifikan secara parsial. Kata kunci: beras, intervensi pasar, volatilitas, Fluctuating rice prices are a problem in Indonesia where the unbalanced amount of rice production and consumption causes an imbalance in the community's economy. Indonesia is a developing country with a low per capita income so that government intervention can reduce the threat of hunger and food insecurity if carried out properly. HET, HPP, Stabilization of Rice Food Supply and Prices (SPHP) and distribution of Food Assistance are some of the policies implemented by the government to maintain price stability and certainty. Therefore, to determine the effect of market intervention policies on rice price volatility at the consumer level, this study was conducted. This study uses the panel data regression analysis method and the Coefficient of Variation (CV). The results of the research that has been carried out found that market intervention simultaneously has a significant effect on rice price volatility at the consumer level. While the t-test shows that only the rice price volatility variable at the wholesaler and producer levels has a significant partial effect. Keywords: market intervention, rice, volatility
Keyword: Beras, Volatilitas, Intervensi pasar

Judul: Impact of Food Policy on Rice Price Volatility at the Retail Level
Abstrak: Peringatan krisis pangan di Indonesia sudah dipropagandakan sejak awal 2023 yang diakibatkan oleh beberapa dampak seperti perubahan iklim ekstrem, pasca pandemi Covid-19, situasi geopolitik, dan kurangnya pasokan bahan pangan. Dalam hal ini, pemerintah perlu memberikan perhatian khusus terhadap ketersediaan pangan, terutama pada bahan pokok utama yang dikonsumsi oleh masyarakat yaitu beras. Harga beras yang tidak stabil dapat mengancam ketahanan pangan di Indonesia. Pemerintah mengupayakan berbagai kebijakan stabilitas harga beras dalam bentuk kebijakan pangan berupa SPHP dan bantuan pangan. Penelitian ini akan memfokuskan pada analisis dampak kebijakan pangan terhadap volatilitas harga beras di tingkat retail dan pola perkembangan volatilitas harga beras di Indonesia. Menggunakan data sekunder berupa data panel bulanan dari tahun 2022-2023. Data harga beras diperoleh pada tingkat retail, pedagang besar, dan produsen kualitas bawah, medium, hingga super yang mencakup beberapa provinsi di Indonesia. Metode analisis yang pada penelitian ini adalah koefisien variasi dan analisis regresi data panel. Hasil menunjukan kebijakan SPHP dan Bantuan Pangan tidak berpengaruh signifikan terhadap volatilitas harga beras di tingkat retail., The warning of a food crisis in Indonesia has been propagated since early 2023 due to several impacts such as extreme climate change, post-Covid-19 pandemic, geopolitical situation, and lack of food supply. In this case, the government needs to pay special attention to food availability, especially to the main staple consumed by the community, namely rice. Unstable rice prices can threaten food security in Indonesia. The government is pursuing various rice price stability policies in the form of food policies in the form of SPHP and food aid. This study will focus on analyzing the impact of food policies on rice price volatility at the retail level and the development pattern of rice price volatility in Indonesia. Using secondary data in the form of monthly panel data from 2022-2023. Rice price data is obtained at the retail level, wholesalers, and producers of low, medium, and super quality covering several provinces in Indonesia. The method of analysis in this study is the coefficient of variation and panel data regression analysis. The results show that the SPHP and Food Aid policies have no significant effect on rice price volatility at the retail level.
Keyword: Policy, Price, Rice, Volatility

Judul: Penggunaan Teorema Homeomorphy 2-Manifold dan Teorema Euler Poincare pada Torus 𝑇�� dan Simplicial Complex 𝐾��
Abstrak: Two dimensional topological spaces are said to be homeomorphic if they have the same topological invariant, where one of topological invariant used is an Euler characteristic. Homeomorphy 2-Manifold’s Theorem and Euler Poincare’s Theorem are used to distinguish two topological spaces. Homeomorphy 2-Manifold’s Theorem uses Euler characteristic to identify two dimensional topological spaces. Euler Poincare’s Theorem is an alternative way to find Euler characteristic with Betti number, which is topological invariant as well. The objective of this paper is to investigate the homeomorphism of torus 𝑇����� and simplicial complex 𝐾�����. Topological space torus and simplicial complex 𝐾����� have the same Euler characteristic, which is two. Based on Homeomorphy 2-Manifold’s Theorem topological space torus 𝑇����� and simplicial complex 𝐾����� is homeomorphic.
Keyword: simplicial, torus, Euler, homeomorphism, topology