Document Type : Research Paper

Authors

1 Associate Professor of Economics, Allameh Tabataba’i University, Tehran , Iran.

2 Professor of Economics, Allameh Tabataba’i University, Tehran , Iran.

3 MA in Environmental Economics, Allameh Tabataba’i University, Tehran , Iran.

Abstract

 
As societies grow and develop, pollution has emerged as a fundamental management challenge in the contemporary world. This issue holds particular significance in developing countries where economic growth and environmental quality often clash in policy-making. Urban solid waste is a prevalent form of pollution afflicting cities, including Tehran. The pivotal question is whether the production of urban solid waste increases in tandem with citizens' incomes. This article delves into the relationship between the per capita income of Tehran residents and the volume of urban solid waste they generate within the Environmental Kuznets Curve (EKC) framework. Given that household activities directly drive municipal solid waste production, the findings of this study shed light on citizens' environmental preferences. Utilizing panel data from 2007 to 2016 across 22 districts of Tehran, the study confirms that the quadratic model hypothesis of the EKC adequately analyzes this relationship based on Wald's test. Additionally, utilizing the fixed effects method, the study demonstrates the significant impact of per capita income on waste generation. Moreover, the analysis includes population density and household size as control variables, revealing a negative correlation between population density and waste production, while the impact of household size remains statistically insignificant.
Keywords: Solid Urban Waste, EKC, Panel Data, Tehran.
Introduction
The escalating population growth, urbanization expansion, and industrial development witnessed in recent decades have significantly elevated environmental concerns. A paramount issue among these concerns is the discharge of diverse pollutants, posing a pressing challenge for contemporary societies and garnering considerable attention from governmental entities, academia, and researchers. Waste, as a by-product of human endeavors, manifests in various dimensions and necessitates thorough examination. This study delves into the production of municipal solid waste (MSW) and its correlation with citizen income.
The primary focus of this research is to scrutinize the interplay between citizens' income levels and waste generation, particularly waste directly emanating from households. The underlying research hypothesis posits that as citizens' income rises, there is an initial upsurge in consumption and subsequent waste production. However, as per capita income levels advance, it is anticipated that individuals' preferences will undergo a transformation. This evolution is envisaged to manifest as a heightened environmental conscientiousness, leading to a shift towards prioritizing environmental quality and consequently diminishing waste generation.
Literature Review
Within the realm of environmental economics, scholarly attention has been directed towards exploring the intricate relationship between waste generation and per capita income through the lens of the Environmental Kuznets Curve theory. This hypothesis posits an inverted U-shaped association between per capita income and environmental degradation, with a specific focus on urban solid waste within the scope of the present study. Over the recent years, the Environmental Kuznets Curve theory has been employed as a theoretical framework to elucidate the link between per capita income levels and the proliferation of diverse environmental pollutants.
The term "Environmental Kuznets Curve" (EKC) was coined by (Dasgupta and Maler, 1994) owing to the resemblance of this curve to the fundamental Kuznets curve. Subsequently, (Shafik and Bandyopadhyay, 1992) posited, under the assumption of technological stability, consistent consumer preferences, and continued investment in environmental conservation, that escalating economic activities serve as a catalyst for environmental deterioration. Expounding on this notion, (Beckerman, 1992) delineated the presence of evidence showcasing environmental pollution during the early stages of economic advancement. Ultimately, Beckerman advocated for the augmentation of societal income as the paramount and most effective strategy to safeguard and ameliorate the environment.
Methodology
The focal point of this study revolves around the interplay between the income levels of Tehran's residents and the volume of solid waste generated by them. Urban solid waste emanates directly from household sources or urban establishments, indicative of the significant influence citizens possess over the production of this particular form of pollution. This investigation draws upon panel data encompassing 22 districts within Tehran. Specifically, the study incorporates data from the 22 districts under the purview of Tehran Metropolitan Municipality over a temporal span stretching from the year 2006 to 2016, totaling a duration of 10 years. The principal dependent variable under scrutiny pertains to the per capita quantity of waste generated by individuals, with this data sourced from official statistics released by the Municipality of Tehran through the Information and Communication Technology Organization.
Results
To initiate the model estimation process, the F-Limer's test was employed to ascertain the distinct impacts of individual sections. The test results unequivocally rejected the null hypothesis with complete certainty, signifying the inadequacy of assuming uniform origins across all regions. Consequently, the data conveys a nuanced perspective by embracing the notion of unique regional effects as opposed to a homogeneous data distribution. Subsequently, the Hausman test was utilized to discern the most appropriate estimation method between fixed effects and random effects.
Upon a thorough examination of the statistical values within the table and the associated probabilities, it was determined that the random effect estimator should be disregarded with a probability exceeding 95%, thereby endorsing the utilization of the fixed effects method. Subsequently, the quadratic model was estimated employing the fixed effects approach.
The estimated coefficients for the variables exhibit significance, barring the household dimension variable. Remarkably, the coefficient of the squared per capita income variable is not only negative but also statistically significant, underscoring the presence of an inverse U-shaped correlation between per capita income and urban solid waste production. This observation aligns with the Environmental Kuznets Curve (EKC) hypothesis, indicating that as the income of citizens in the 22 districts of Tehran rises, the initial surge in solid waste generation eventually plateaus and diminishes beyond a certain threshold. Moreover, the estimated coefficient for population density displays a negative and statistically significant relationship with urban solid waste production, elucidating that heightened population density inversely correlates with the amount of solid waste yielded by inhabitants.
Discussion
In specific districts within Tehran, the initiation of efforts to diminish urban waste generation has been spurred by income escalations, while in alternate areas; a decline in waste output is projected to transpire once a particular threshold of per capita income is reached. It is imperative to emphasize that these outcomes should not be construed to imply a passive reliance on income augmentation alone to address urban waste management issues, thereby underscoring the continued significance of espousing efficient policies within this domain.

Keywords

 
Beckerman, W. (1992). Economic Growth and the Environment: Whose Growwth? Whose Environment? World Development: 20, 481-496.
Dasgupta, S., Laplante, B., Wang, H., & Wheeler, D. (2001). Confronting the Environmental Kuznets Curve. journal of Economics Perspectives: Vol. 16, No. 1, 147-168.
Dinda, S. (2004). Environmental Kuznets Curve Hypothesis: A Survey. Ecological Economics: 49,.341-455.
Gnonlonfin, A., Kocoglu, Y., & Peridy, N. (2017). Municipal Solid Waste and Development: The Environmental Kuznets Curve Evidence for Mediterranean Countries. Region et Development, Vol. 45, 113-130.
Grossman, G., & Krueger, A. (1991). Environmental Impacts of the North American Free Trade Agreement. National Bureau of Econom Research, Vol. 3914.
Grossman, G., & krueger, a. (1995). Economic Growth and the Environmental. Quarterly Jornal of Economics, Vol. 110.
Kaza, S., Yao, L., Bhada-tata, P., & Van Worden, F. (2018). What a Waste 2.0: A Global Snapshot of Solid Waste Management to 2050. Washington DC: World Bank.
Mazzanti, M., Montini, A., & Zoboli, R. (2006a). Decoupling Emission Trends and the EKC Hypothesis: New Evidance Using Sector and Provincial Panel Data fo Italy. Economic Department of Pavia University.
Mazzanti, M., Montini, A., & Zoboli, R. (2006b). Municipal Waste Production Economic Drivers and New Wast Policies: EKC Evidence from Italiam Regional and Provincial Pandel Data. Zoboli Fondazione Eni Enrico Mattei: 155.
Nourbakhshsamani, N; H. S. Fami and H. Amadeh (2021). Quantitative and Qualitative Benefits of Household Efforts to Dry Food Waste at Source. International Journal of Science and Tecnology, Aug. 2021.
Porter, M. E., & Linde, C. (1995). Toward a New Conception of the Environmental-Competitiveness Relationship. Economic Perspectives: Vol. 9, No. 4, 97-118.
Shafik, N., & Bandopadhay S. (1992). Economic Growth and Environmental Quality, Background Paper for World Development Report.
Yang, K., YE, M., & XU, Q. (2003). Environmental Kuznets Characteristics of Municipal Solid Waste Growth in Shanghai. Department of Environmental sciences, Urban & Environmental Open Laboratory, East China Normal Universiy.
References [In Persian]
Amadeh, Hamid and Ziraki Faezeh. Evaluation of the Technical Efficiency of the Municipalities of 22 Districts of Tehran in Household Waste Management. The Second National Conference on Environmental Protection and Planning, August 2012. [In Persian]
Central Bank of Islamic Republic of Iran. (1397) The Results of Household Budget Survey in Urban Areas of Iran in 2016. Department of Household Budget Review, Department of Economic Statistics, General Management of Economic Statistics, Central Bank of the Islamic Republic of Iran. [In Persian]
Habibi, S. Mohsen and Bernard Hurkad. (1384) Atlas of Tehran Metropolis. Tehran: Urban Processing and Planning Company (Tehran Municipality), 218 pages. [In Persian]
Information and Communication Technology Organization of Tehran Municipality. (1387) Statistics of Tehran city 1387, statistical yearbook of Tehran city. Tehran: Publications of Information and Communication Technology Organization of Tehran Municipality. [In Persian]
Information and Communication Technology Organization of Tehran Municipality. (1388) Statistics of Tehran city 1388, statistical yearbook of Tehran city. Tehran: Publications of Information and Communication Technology Organization of Tehran Municipality. [In Persian]
Information and Communication Technology Organization of Tehran Municipality. (1389) Statistics of Tehran city 1389, statistical yearbook of Tehran city. Tehran: Publications of Information and Communication Technology Organization of Tehran Municipality. [In Persian]
Information and Communication Technology Organization of Tehran Municipality. (1390) Statistics of Tehran city 1390, statistical yearbook of Tehran city. Tehran: Publications of Information and Communication Technology Organization of Tehran Municipality. [In Persian]
Information and Communication Technology Organization of Tehran Municipality. (1391) Statistics of Tehran city 1391, statistical yearbook of Tehran city. Tehran: Publications of Information and Communication Technology Organization of Tehran Municipality. [In Persian]
Information and Communication Technology Organization of Tehran Municipality. (1392) Statistics of Tehran city 1392, statistical yearbook of Tehran city. Tehran: Publications of Information and Communication Technology Organization of Tehran Municipality. [In Persian]
Information and Communication Technology Organization of Tehran Municipality. (1393) Statistics of Tehran city 1393, statistical yearbook of Tehran city. Tehran: Publications of Information and Communication Technology Organization of Tehran Municipality. [In Persian]
Information and Communication Technology Organization of Tehran Municipality. (1394) Statistics of Tehran city 1394, statistical yearbook of Tehran city. Tehran: Publications of Information and Communication Technology Organization of Tehran Municipality. [In Persian]
Information and Communication Technology Organization of Tehran Municipality. (1395) Statistics of Tehran city 1395, statistical yearbook of Tehran city. Tehran: Publications of Information and Communication Technology Organization of Tehran Municipality. [In Persian]
Information and Communication Technology Organization of Tehran Municipality. (1396) Statistics of Tehran city 1396, statistical yearbook of Tehran city. Tehran: Publications of Information and Communication Technology Organization of Tehran Municipality. [In Persian]
Information and Communication Technology Organization of Tehran Municipality. (1397) Statistics of Tehran city 1397, statistical yearbook of Tehran city. Tehran: Publications of Information and Communication Technology Organization of Tehran Municipality. [In Persian]
Sedaghatparast, Eldar. (1387) Investigation of the Kuznets Environmental Curve Hypothesis Considering the Solid Wastes of Tehran city. Master's thesis. Faculty of Economic and Political Sciences, Shahid Beheshti University. [In Persian]
Arabmazar, A. Akbar and Eldar Sedaghatparast. (1388) Investigation of Kuznets Environmental Curve process Considering Tehran's Solid Wastes. Economic Research Quarterly: 1-20-1. [In Persian]
Falahi, Firoz, Asgharpour; Hossein, Behbodhi Davood and Simin Pournazmi. (1391) Kuznets environmental curve test in Iran using LSTR method. Energy Economy Studies: 32 73-94. [In Persian]
Statistical Center of Iran. (13990 Demographic, Social and Economic Characteristics of the 22 Districts of Tehran in the census of 2010 and 2015. Tehran: National Program and Budget Organization. [In Persian]
 
استناد به این مقاله:  آماده، حمید.، قاسمی، عبدالرسول.، جیرسرایی، امیرمحمد. (1403). رابطه پسماند جامد شهری و درآمد شهروندان در مناطق 22 گانه شهر تهران،  فصلنامه برنامه‌ریزی توسعه شهری و منطقه‌ای، 9(28)، 49 -76. DOI: 10.22054/urdp.2023.70326.1482
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