Home Country
As H is relatively L-abundant, H's PPF is relatively biased toward L-intensive X.Before trade, H will consume what she produces. Therefore, the autarky equilibrium is where the indifference curve is the tangent of PPF.
H produces and consumes OHXH of X and produces and consumes OHYH of Y. H has IH of utility.
Foreign Country
By the same logic, before trade, F produces and consumes at EF.
From these three facts, it can be conjectured that PX is relatively lower in H and PY is relatively lower in F.
Combining the two countries' graphs will give
