I'm a little confused by this statement:

> For example, Dutch workers are on par with American workers in terms of productivity per hour.

If it's productivity per hour, doesn't that mean that the total productivity of Americans per week (or year) would be higher? Because as you're saying it, then Americans work 40h a week, and you work 30h a week, yet Americans are able to maintain the same level of productivity per hour.

So can you clarify whether it's really same productivity per hour, or whether you meant same productivity say..per week, or month, or year. Because if it's per week, then the Dutch productivity would have to be higher per hour than the American productivity, in order to be the same "per week".