For the best explanation of what happened in Europe and Japan, he points to research by fellow Nobelist Ed Prescott. In Europe, governments typically commandeer 50% of GDP. The burden to pay for all this largess falls on workers in the form of high marginal tax rates, and in particular on married women who might otherwise think of going to work as second earners in their households. "The welfare state is so expensive, it just breaks the link between work effort and what you get out of it, your living standard," says Mr. Lucas. "And it's really hurting them."No doubt that (theoretically) high taxes could discourage effort but is this statement empirically relevant? Below is a chart of marginal tax rates (as estimated by the OECD) and the female employment to population ratio for the age range (25-54) for 2010. I have chosen that particular employment to population ratio because it matches the statement in the quote above (the chart looks similar if we look at a different age range or male participation rates).
Do we see more or less effort in countries with high tax rates? Not obvious. In fact, in the sample I have selected there seems to be a positive correlation, not a negative one. Countries with strong welfare state, high taxes (both average and marginal) show higher level of efforts as measured by employment to population ratios. The US appears as a country with low taxes but also low levels of effort.
The chart above is, of course, not the final answer to the question of how taxes affect labor market outcomes but at least it gives as good argument to dispute the claim that all European problems are about high taxes.