Theory and observation set out the conditions such that market prices of outputs and productive inputs select an allocation of factor inputs by comparative advantage, so that (relatively) low-cost inputs go to producing low-cost outputs.
Theory d akayad iknan talɣiwen chund alqim tan win hebu n intaj tan d adom taj in nefran n tazunt n adom s tigdaht i as adom tan wi raqqosnen ad ijichan intaj tan wi raqqosnen