Constructions of the following form:
"Home (Foreign) produces and consumes two goods, with x being its natural import (export) good and y being its natural export (import) good."
Why do I hate it? First of all because I find these sentences take me about twice as long to understand. But you may say why should my mental disability sway you away from this beguilingly compact way of expressing yourself? The second argument against it is that parentheses have a traditional use in written prose. They are to provide information that amplifies or qualifies the preceding text. The third point (which is closely related to the second point) is that a sentence should make sense when it is read out loud. Try reading the above sentence out loud. It emerges as nonsense.
So how should the sentence have been written? How about the following: "Each country consumes two goods. The home country is the natural importer of x and the foreign country is the natural importer of y."