This paper addresses various attempts by so-called new Keynesians, writing mainly in the 1980s and 1990s, to strengthen the analytical basis, in particular the microeconomic foundations, of these assertions. What, exactly, have then the new Keynesians accomplished, and how should their...

We analyze investment decisions when information is costly, with and without delegation to an agent. We use a rational-inattention model and compare it with a canonical signal-extraction model. We identify three "investment conditions". In "sour" conditions, no information is acquired and no...

This paper suggests various alternatives to the Harris-Todaro theory in explaining unemployment in segmented labor markets. We focus on a labor market with i perfectly competitive secondary sector and an imperfectly competitive primary sector, the latter combining salient features of the...

This paper analyzes economic-social interaction in China in connection with the country's change of economic system. I define an economic system in terms of a multidimensional vector of broad institutional characteristics, and I emphasize that important features of the social development are...