The aim of this essay is to examine economists' views about the relationship between Marshallian and Walrasian theory. Are they complementary, as is usually believed, or do they constitute alternative research programs? I compare two viewpoints on this matter, the conciliatory and the...

In this paper I ponder upon the meaning of the perfect information assumption, and argue that a distinction should be drawn between the Walrasian and Marshallian conceptions of perfect information. I show that the Marshallian conception is more demanding than the Walrasian, due to the absence of...