The key role of technological change in the decline of energy and carbon intensities of aggregate economic activities is widely recognized. This has focused attention on the issue of developing endogenous models for the evolution of technological change. With a few exceptions this is done using...

We explore the limitations of the adaptationist view of evolution and propose an alternative. While gradual adaptation can explain some biological and economic diversity, it cannot account for radical innovation (especially during the past 10,000 years). We argue that ubiquitously available but...

The Lucas (1978) Tree Model lies at the heart of modern macro-finance. At its core, it provides an analysis of the equilibrium price of a long-lived asset in an exchange economy where consumption is the objective, and the sole purpose of the asset is to smooth consumption through time....

Prior laboratory experiments have studied general equilibrium economies constructed from \induced preferences" for artificial goods. We introduce new methods that allow us to study economies constructed instead from subjects' actual, \homegrown" preferences. Our subjects reveal their preferences...

Prior laboratory experiments have studied general equilibrium economies constructed from "induced preferences" for artificial goods. We introduce new methods that allow us to study economies constructed instead from subjects' actual, "homegrown" preferences. Our subjects reveal their preferences...