I study a model of trading under asymmetric information where traders can acquire expertise to become better informed. Within the context of this model, I propose and implement a method to estimate the ratio of the marginal social value to the marginal private value of expertise. More expert traders get rents because they can choose which assets to trade and they add social value because by cha...

We investigate the properties of mean-variance efficient portfolios when the number of assets is large. We show analytically and empirically that the proportion of assets held short converges to 50% as the number of assets grows, and the investment proportions are extreme, with several assets held in large positions. The cost of the no-shortselling constraint increases dramatically with the num...

The main objective of this research is the index of profitability on the capital structure of listed companies on the Stock Exchange of Tehran. Statistical population consisted of all above companies that 138 companies were selected in time zone of 2011-2014 after screening method (systematic elimination). The research method is descriptive and correlation and study variable is profitability in...

This study aims to test the effect of Capital Adequacy Ratio (CAR), Loan Deposit (LDR), and Operational Efficiency (OER) on Return Assets (ROA) during Covid-19 pandemic. utilizes a purposive sampling method using population National Private Commercial Banks (NPCB) for foreign exchange listed Indonesia Stock Exchange (IDX). The data used is Annual Report 2019-2020 period which has been published...

In this paper the principal-agent models between the investor and the manager of the open-ended fund are made from the new view about the liquidity risk management, and the optimal contracts and optimal policies are obtained in closed form by solving these modes. By the analysis of the optimal contract, we find that the fixed compensation of manager is the positive relationship with redemption ...

We investigate the properties of mean-variance efficient portfolios when the number of assets is large. We show analytically and empirically that the proportion of assets held short converges to 50% as the number of assets grows, and the investment proportions are extreme, with several assets held in large positions. The cost of the no-shortselling constraint increases dramatically with the num...

the debt is one of the principal component of accounting equation and capital structure of most companies. during last fifteen years the usage trend of debt was increasingly improved in companies' eps. american ones. in this research we tried to answer the following question: is there any meaningful relation between debt ratio and return on assets (roa) in sec of tehran and its industries?...