<Table> <Tr> <Td> </Td> <Td> This article includes a list of references, but its sources remain unclear because it has insufficient inline citations . Please help to improve this article by introducing more precise citations . (February 2015) (Learn how and when to remove this template message) </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> This article includes a list of references, but its sources remain unclear because it has insufficient inline citations . Please help to improve this article by introducing more precise citations . (February 2015) (Learn how and when to remove this template message) </Td> </Tr> <P> A substitute goods is one goods that can be used instead of another . In consumer theory, substitute goods or substitutes are products that a consumer perceives as similar or comparable, so that having more of one product makes them desire less of the other product . Formally, X and Y are substitutes if, when the price of X rises, the demand for Y rises . </P> <P> Potatoes from different farms are an example: if the price of one farm's potatoes goes up, then it can be presumed that fewer people will buy potatoes from that farm and source them from another farm instead . </P>

When are two goods said to be substitutes of each other