# Mathematical Models of Economic Growth and Crises

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The main goal of this book is to present coherent mathematical models to describe an economic growth and related economic issues. The book is a continuation of the author’s previous book Mathematical Dynamics of Economic Markets, which presented mathematical models of economic forces acting on the markets. In his previous book, the author described a system of ordinary differential equations, which connected together economic forces behind the product’s demand, supply and prices on the market.

The author focuses on a specific aspect of how to modify the said system of ordinary differential equations, in order to describe the phenomenon of economic growth. In order to achieve clarity, the author restricted himself to economic processes arising on the markets of a single-product economy. Economic growth is presented as a result of savings and investment occurring on the markets. The market’s participants withdraw part of the product from markets in the form of savings and use the withdrawn product in production in the form of an investment. The withdrawal drives the product’s supply on the market down while at the same time driving the product’s price up, which in turn drives the product’s demand down. When an impact of the product’s price increase exceeds an impact of the product’s demand decrease, economic growth occurs. Contrarily, one observes an economic decline in the opposite situation.

The author looks into various aspects that savings and investment exert on the market. He in particular discusses the models that examine an economic growth in situations when savings and investment were done in the form of a one-time withdrawal of the product, constant-rate withdrawal of product, constant-accelerated withdrawal of product, and exponential withdrawal of product from the market.

The author further examines an impact of four economic concepts on economic growth – demand, supply, investment, and debt. He presents mathematical models exploring interconnections among these concepts and studies their mutual impacts on both economic growth and decline. He builds a mathematical model in order to verify a hypothesis that weak recovery after the financial crisis could be attributed to the decline of investments that were not compensated by the decrease of an interest rate.

The author also looks into the phenomenon of economic crises and builds a few mathematical models. The models of four economic crises are considered. The first model concerns the last financial crisis where an author tried to explain how relatively small disturbances on financial markets had produced a large impact on the real economy. His conclusion is that fluctuations on connected markets amplify each other, which is known as the resonance phenomenon. The second model relates to the monetary part of Japanese economic policy known as Abenomics, where the price of Japanese bonds decreases and the yield increases. The author builds a mathematical model to investigate this phenomenon. The third model is about a secular stagnation hypothesis advanced by Lawrence Summers. The author complements his model of economic growth with the external supply of product to the market. He found that external supply provided with either constant rate or constant acceleration can cause a restricted or unrestricted economic decline, respectively. The fourth model is a model describing the four stages of the Greek economic crisis (before the Eurozone, before the Euro crisis, after the Euro crisis, and during the austerity period) and two potential recovery stages (with austere and benign economic transformations). (Imprint: Nova)

List of Figures

Chapter 1. Introduction

Chapter 2. Savings and Investment

Chapter 3. Economic Trends

Chapter 4. Models of the Crises

Chapter 5. Summary

References

Author's Contact Information

Index

Krouglov, Alexei (2006). Mathematical Dynamics of Economic Markets. New York: Nova Science Publishers.
Krouglov, Alexei (2009). Mathematical Dynamics of Economic Growth as Effect of Internal Savings. Finance India, Vol. 23, No. 1, 99-136.
Krouglov, Alexei (2013). Simplified Mathematical Model of Financial Crisis. Journal of Advanced Studies in Finance, Vol. IV, No. 2 (8), 109-114.
Krouglov, Alexei (2014a). Monetary Part of Abenomics: A Simplified Model. Available at SSRN: http://ssrn.com/abstract=2390372
or http://dx.doi.org/10.2139/ssrn.2390372.
Krouglov, Alexei (2014b). Secular Stagnation and Decline: A Simplified Model. Available at SSRN: http://ssrn.com/abstract=
2540408 or http://dx.doi.org/10.2139/ssrn.2540408.
Krouglov, Alexei (2015a). Credit Expansion and Contraction: A Simplified Model. Available at SSRN: http://ssrn.com/abstract= 2604176 or http://dx.doi.org/10.2139/ssrn.2604176.
Krouglov, Alexei (2015b). Economic Growth and Debt: A Simplified Model. Available at SSRN: http://ssrn.com/abstract=2621227 or http://dx.doi.org/10.2139/ssrn.2621227.
Krouglov, Alexei (2015c). Mathematical Model of the Greek Crisis. Available at SSRN: https://ssrn.com/abstract=2644493 or
http://dx.doi.org/10.2139/ssrn.2644493.
Krouglov, Alexei (2016). Mathematical Model of the Economic Trend. Available at SSRN: https://ssrn.com/abstract=2864898.
Petrovski, Ivan G. (1966). Ordinary Differential Equations. Englewoods Cliffs, New Jersey: Prentice Hall.
Piskunov, Nikolai S. (1965). Differential and Integral Calculus. Groningen: P. Noordhoff.

Audience: Researchers and practitioners in the field of Mathematical Economics.

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