We study the statistical properties of three estimation methods for a model of learning that is often fitted to experimental data: quadratic deviation measures without unobserved heterogeneity, and maximum likelihood with and without unobserved heterogeneity. After discussing identification...

When two countries starting from different quality levels (reflecting different conditions on domestic market demands) open to trade, two possible equilibria arise. In the first, the quality leader maintains its position. In the second, leapfrogging occurs. However, the latter is possible only...