$\backslash$table$[[$Country A$,$Country B$,,],[$Good X Good Y$,$Good X Good Y$,,],[90,0,30,0],[60,30,20,20],[30,60,10,40],[0,90,0,60]]$

Refer to Exhibit $34-1.$ Country B is the lower opportunity cost producer of

neither good.

good X$.$

both goods.

good Y$.$