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The longer-term impacts of the COVID-19 pandemic on the European food supply chain may be substantially different than the short-term adaptation of farmers, food processors and retailers. The main consumer preference changes are likely to be linked to greater on-line ordering, home delivery and in-home consumption. The food industry changes will probably be more persistent and of greater magnitude than those on the consumer side, including a preference for production and processing closer to consumption, and greater flexibility in processing. The COVID-19 pandemic will promote greater automation throughout the food chain with automation of combinable crops leading the way because the engineering is more tractable than for fruits and vegetables. The COVID-19 pandemic will lead to a re-emphasis on food production and food security in agricultural policy throughout Europe. That re-emphasis of food security will be strongest in those countries which saw the largest and longest disruption in consumer level food availability. The COVID-19 pandemic has disrupted the European food system, but in the longer run it could also create opportunities for those ready to adapt to the changing realities.

The objective of this study is to provide empirical evidence on the short- and long-run relationships between the short-term interest rate, London interbank offered rate (LIBOR) and macroeconomic policy objectives, such as price stability, economic growth, and stability of the exchange rate market. For this purpose, we deploy quarterly frequency data from the United Kingdom between 2000 and 2015 and adopt a multiple regression model. Furthermore, this study uses the Johansen, Stock-Watson cointegration test and the Granger Causality test in order to examine the dynamic short- and long-run relationships among LIBOR, the consumer price index as a proxy of price stability, the real gross domestic product as a proxy of economic growth, and the exchange rate as a proxy of exchange rate market stability. The results showed that all variables have the same order of integration and long-run equilibrium relationships exist between them. The results show evidence of long-run equilibrium relationship between the variables with strong evidence of unidirectional granger causality flow from GDP, CPI and exchange rates to LIBOR. The recommendations proposed in this study have important policy implications for the U.K. government. It is therefore recommended that policy makers and government authorities together with the Bank of England develop and pursue sensible fiscal and monetary policies that would aim at stabilizing both the micro- and macroeconomic indicators such as the inflation rate, interest rate, exchange rate, and money supply, to enhance the growth of the economy, especially for the period after the BREXIT decision.Keywords. Macroeconomics, Interest rate, Monetary policy, London interbank offered rate, United Kingdom.JEL. E43, E51, E58.

This thesis consists of two parts. In the first part, we concentrate on the computation of Market Equilibria and settle the long-standing open problem regarding the computation of an approximate Arrow-Debreu market equilibrium in markets with CES utilities. We prove that the problem is PPAD-complete when the Constant Elasticity of Substitution parameter $\rho$ is any constant less than -1. Building on this result, we introduce the notion of non-monotone utilities, which covers a wide variety of utility functions in economic theory, and prove that it is PPAD-hard to compute an approximate Arrow-Debreu market equilibrium in markets with linear and non-monotone utilities. In the second part, we study Revenue Maximization. We begin by resolving the complexity of the revenue-optimal Bayesian Unit-demand Item Pricing problem when the buyer's values for the items are independent. We show that the problem can be solved in polynomial time for distributions of support size 2; but its decision version is NP-complete for distributions of support size 3. Next, we study the optimal mechanism design problem for a single unit-demand buyer with item values drawn from independent distributions. We show that, for distributions of support-size 2 and the same high value, Item Pricing can achieve the same revenue as any menu of lotteries. On the other hand, we provide simple examples where randomization improves revenue. Finally, we show that unless the polynomial-time hierarchy collapses, namely P^{NP}=P^{#P}, there is no universal efficient randomized algorithm that implements an optimal mechanism even when distributions have support size 3.

One of the most important reasons that led Greece to the current macroeconomic instability is the high military spending during the last decades. Thus, it is necessary to examine the impact of military spending on economic growth for the case of Greece. Furthermore, it will be very useful to examine the arms race hypothesis between Greece and Turkey in order to identify if there is an interaction between these countries that leads to the high level of military spending. In this paper we empirically test the relationship between military spending and economic growth for Greece and Turkey during 1957-2013, and examine the validity of arms race hypothesis between the two countries. We deployed unit root tests, unit root tests with structural changes, cointegration techniques and finally Granger causality tests. Granger causality tests in the case of Greece and Turkey imply that the causality runs from military spending to economic growth, however we find that there is no evidence of causality between Greek and Turkish military spending, which mean that that these countries act independently.Keywords. National Government Expenditures, National Security and War, Arms race, Greece, Turkey, Economic Growth, ADF, VAR.JEL. H5, H56, O40, E62.

In the last twenty years many developed countries have faced significant public deficits, while the ability of government authorities to deal with public deficits has been receiving rising awareness from economists and policy makers. This is an imperative topic, in provisions of economics and public policy, and it is a central subject for the EMU area; hence, they are the main motivations of this paper. Theoretically, equilibrium growth paths have to be supported by adequate fiscal policy. The risk of a default on Greek sovereign debt during the last years has worried the Euro into its first serious crisis and raised the issue of debt sustainability in Europe. There is no universally accepted definition for sustainable fiscal policy. However, economists agree that expanding public debt is not sustainable. Budget policy is constrained by the need to finance the deficit. In this paper we provide a synthesis of empirical research in the validity of the Sustainability of Fiscal Policy of the existing literature for the period 1986-2012. These studies used both time series and panel data sets and empirically examined the Sustainability of fiscal policy for a single country and for a group of countries (multi-country studies). Furthermore, there are studies using data on government expenditure at the provincial or state level. Existing studies in this topic vary in the country selection. They used data for developed, developing countries or group of both, while most of them examined developed or industrial countries. All these studies found different empirical results: support, no support or mixed results.Keywords. Fiscal policy sustainability; Budget deficits; Government debt; cointegration; structural breaks.JEL. E62, H62, H63.

The role of Fiscal policy in the long run growth process has been crucial in macroeconomics since the appearance of endogenous growth models. Additionally, a significant debate among economists involves whether several types of spending or taxation enhance economic growth. The main objective of this paper is to highlight the relationship between fiscal policy and economic growth in the EU-15, and make an attempt to determine which of the fiscal policy instruments enhance economic growth.We deployed panel data techniques and included both sides of budget, spending and taxation, in our regressions and used the most recent dataset data for fiscal variables from Eurostat. We made a new classification of public expenditures into homogeneous groups in order to reduce the explanatory variables and increase the efficiency of our model and results since we have data for only 14 years. In our empirical analysis we included OLS, fixed effects models, random effects models and GMM estimators, the Arellano and Bond (1991) and the Arellano and Bover (1995) - Blundell and Bond (1998) estimators.On the first round of our regressions we find a negative impact of spending on human capital accumulation on economic growth. Our empirical results also indicate that an increase on government spending on infrastructure has a significant positive impact on the economy growth of a country. Additionally, in our regressions the variable government spending on property rights protections include spending on defence and spending on public order safety. Our empirical results from the first round of regressions imply a strongly negative relationship between these two variables. However, on the second round of our regressions we aggregate defence spending from spending on property right protection and we did not find any relationship between economic growth and defence spending. Moreover, we found a non-significant relationship between government spending on social protection and economic growth. On the second round of regressions, when we allow for non-linear growth effects we find a positive relationship with deficits and economic growth, which is in contrast with Ricardian Equivalence. We also included the employment growth and business investment in our model because labour and capital are very important factors of production in growth models. In our empirical results we do not find a significant impact of employment on economic growth, but when we allow for non-linear growth effects we find a strongly positive impact. However, we found that gross fixed capital formation of the private sector as a percentage of GDP in both rounds of our regressions, has no significant impact on economic growth. Finally,our empirical results do not support any evidence of relationship between openness and economic growth.Keywords. Panel Data. Fiscal Policy. Taxation. Government Expenditures.JEL. C23, C33, E62, H2, H5.

Proceedings of the 3rd INFER Symposium on Agri-Tech Economics for Sustainable Futures