Impact of Coronavirus and Macroeconomic Indicators on Sharia Obligation with Simultaneous Model

This study examines the macroeconomic variables exchange rate and BI rate in collaboration with the Coronavirus Disease case against Sukuk. In addition, this study also examines the exchange rate influenced by the BI rate variable and the case of Coronavirus Disease. The data analysis method in this study uses a simultaneous equation model Two-Stage Least Square. This study found that the exchange rate affects the demand for Sukuk while the BI rate does not affect it. But what is surprising is that when the Coronavirus Disease 2019 case occurred, it did not affect the demand for Sukuk. This study also found that the exchange rate is influenced by the BI rate and the case of Coronavirus Disease. The contribution of this research is that when the government cannot intervene in the exchange rate, which can affect the demand for Sukuk, it can be done by intervening in the BI rate.JEL Classification: C30, G12, O10How to Cite:Bawono, A., Rofiuddin, M., Nabila, R., & Anwar, S. (2021). Impact of Coronavirus and Macroeconomic Indicators on Sharia Obligation with Simultaneous Model. Signifikan: Jurnal Ilmu Ekonomi, 10(1), 291-298. https://doi.org/10.15408/sjie.v10i2.21084.

Application of Chemometrics Into Removal of Dyes by NaX Nanozeolites: Simultaneous Model

In the present study, the simultaneous removal of malachite green (MG) and auramine-O (AO) dyes from the aqueous solution by NaX nanozeolites in a batch system is investigated. Taguchi method and response surface methodology (RSM) were used to optimize and model dye removal conditions. In order to do so, the effect of various factors (dyes concentration, sonication time, ionic strength, adsorbent dosage, temperature, and pH of the solution) on the amount of dye removal was evaluated by the Taguchi method. Then, the most important factors were chosen and modeled by the RSM method so as to reach the highest percentage of dye removal. The proposed quadratic models to remove both dyes were in good accordance with the actual experimental data. The maximum removal efficiencies of MG and AO dyes in optimal operating conditions were %99.07 and %99.61, respectively. Also, coefficients of determination (R2) for test data were 0.9983 and 0.9988 for MG and AO dyes, respectively. The reusability of NaX nanozeolites was evaluated during the adsorption process of MG and AO. The results showed that the adsorption efficiency decreases very little up to 5 cycles. Moreover, NaX nanozeolites were also applied as adsorbents to remove MG and AO from environmental water samples and more than %98.1 of both dyes were removed from the solution in optimal conditions.

Joint Determinants of Monetary, Macroeconomic, Social and Income Inequality

This study discusses all the potential relationships between monetary, macroeconomic, social and income inequality in an integrated manner by making Indonesia a concrete case study. This empirical study discussed the relationship based on theoretical modelling and carried out through appropriate estimators applied to the data of 33 provinces in Indonesia. To achieve this objective, the simultaneous model of seemingly unrelated regressions (SUR) was used. The results concluded that there are variables that jointly determined the monetary, macroeconomic and social also income inequality. Like, consumption can increase inflation and macroeconomic while at the same time can reduce population growth and human development, and increases income inequality. Savings which determine credit also pushes macroeconomics while simultaneously increasing population growth, and it can reduce income inequality. Minimum wages can reduce inflation and encourage production growth, while increases human development and reduces population growth also can reduce income inequality. Unemployment can also reduce inflation and increase economic growth, at the same time reduces population growth and human development while increases income inequality. Education and health encourages economic growth and the level of human development then can reduce income inequality.