Relative prices - efficient allocation of resource

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How does relative prices lead to an efficient allocation of resources?

[DoctorTwo]

Relative prices affect what and how suppliers produce. When demand increases or supply decreases for a good, that good's price will increase relative to its substitutes. For example, when the relative price of one good, such as oranges, is higher than a substitute, such as apples, suppliers tend to repel resources away from apples and towards oranges. This occurs because, as the prices of oranges are relatively greater, more profit will be earned by producing them, than will be earned producing apples. Therefore, as there is probably more demand for them, society's wellbeing can be fulfilled to a greater extent by producing oranges, so resources are diverted towards their production, and resources are allocated efficiently.