In this next volume of Progress in Economics Research, chapters include research on the elements that are important for the understanding of international development; the intellectual property rights' impact upon foreign direct investment inwards and foreign direct investment outwards and trade; the selection of the best energy mix on the basis of the most efficient utilisation of all available energy sources for the generation of electricity to ensure its future economic and social development; the efficiency of resource utilisation of twenty OECD countries; liquidity management under the principal-agent conflict; a discussion on the estimated surplus land value of real estate benefited by the public investment on infrastructure considering only the land value without the construction value and spatial location; the determinants of inventory investment; the prisoners' dilemma, congestion games and correlation; and rational choice theory, state abortion policy, unintended pregnancy and its economic implications.