Suppose that the income of Archyland's citizens decreases. This will cause Archyland's demand for Loompaland goods to decrease so the demand for loompas will shift to the left. Archyland's demand for Loompaland goods to decrease so the demand for loompa will shift to the left. Archyland's supply of goods to increase so the supply of archys will shift to the right. Archyland's supply of goods to decrease so the supply of archys will shift to the right