Assume that there are two countries which can produce two goods, burgers (B) and fries (F), using labour as the only production factor. Workers in both countries eat both burgers and fries. There are 1 million workers in country 1, and 2 million workers in country 2.

The marginal products of labour (MPLs) in each country are given in the following table:

MPL of burgers (in tons) MPL of fries (in tons)

country 1 MPLB = 1 MPLF = 2

country 2 MPL*B = 3 MPL*F = 4

Now imagine that the population of country 1 increases by 50% whereas the population of country 2 reduces to a fifth of its original size. Describe how the two countries' comparative advantages change. Explain your answer.