A unifying formal classification of the different types of R&D growth models is used in this paper to discuss how they face with the fact that not only R&D employment, but also the R&D employment share has risen dramatically in the advanced countries over the last fifty years. Depending on the...

In this paper we test the AK model of growth with laboratory experiments. In each period, agents produce and trade output in a market, and allocate it to consumption and investment. The economy should experience a constant and positive rate of growth. We analyze two treatments differing from...