Some recent theoretical papers show that margin requirements can affect asset prices. Such results are important, for example, to understand the unconventional polices implemented by the Fed during the financial crisis of 2007-2010. However, empirical evidence remains scarce. The present article...

This paper analyzes the presence of a speculative component during the extra ordinary upsurge in Karachi Stock Exchange. We implement cointegration tests, between 1997 and 2008, on price and dividends of various market and sectoral indices. The no bubble hypothesis could not be rejected for...

This paper proposes that all new euro area sovereign borrowing be in the form of jointly guaranteed Eurobonds.  To avoid classic moral hazard problems and to insure the guarantors against default, each country would pay a risk premium conditional on economic fundamentals to a joint debt...

This study sheds new light on the question of whether or not sentiment surveys, and the expectations derived from them, are relevant to forecasting economic growth and stock returns, and whether they contain information that is orthogonal to macroeconomic and financial data. I examine 16...

This is the graduation speech I gave on receiving an honorary doctorate at the University of Athens Economics and Business School. I talk about my Greek family, about how I got interested in economics, and then how in the 1990s I came to think about default, collateral, and leverage as the...

We show how the timing of financial innovation might have contributed to the mortgage bubble and then to the crash of 2007-2009. We show why tranching and leverage first raised asset prices and why CDS lowered them afterwards. This may seem puzzling, since it implies that creating a derivative...

We show how the timing of financial innovation might have contributed to the mortgage boom and then to the bust of 2007-2009. We study the effect of leverage, tranching, securitization and CDS on asset prices in a general equilibrium model with collateral. We show why tranching and leverage tend...

We present new international diversification indexes across equity, sovereign debt, and real estate. The indexes reveal a marked and near ubiquitous decline in diversification potential across asset classes and markets for the post-2000 period. Analysis of panel data suggests that the decline is...

The objective of this paper is to examine the absolute and risk-adjusted effects on distribution rates and total wealth created by adding loss-limiting trend following strategies to buy and hold portfolios. Using 150 years of equity and bond data, we found that applying trend following to...