In Adam's Fallacy, Foley writes:
"Smith distinguishes what he calls the nominal price of a commodity (the amount of money for which it exchanges) from the real price of the commodity, the amount of labor required to produce it." (p. 12)
Later he writes:
"The market price is just the amount of money for which the commodity changes hands at any particular moment; it rises and falls because of shortages and gluts, changes of taste and supply, and speculation. But Smith believes there are important forces that tend to push the market price back toward a certain level, which he calls the natural price of the commodity. Since there are always disruptions in any market, he does not expect the market price to converge smoothly to the natural price and then stay there, but instead believes it will fluctuate or (adopting an image from Newtonian planetary physics) “gravitate” around the natural price." (p. 13 et. seq.)
Is there a difference between the nominal price and the market price, and between the real price and the natural price? Because to me, the two pairs of terms seem to match up.