<Tr> <Td> Butter </Td> <Td> Margarine </Td> <Td> + 0.81 </Td> </Tr> <Tr> <Td> Beef </Td> <Td> Pork </Td> <Td> + 0.28 </Td> </Tr> <Tr> <Td> Entertainment </Td> <Td> Food </Td> <Td> - 0.72 </Td> </Tr>

Demand curve showing cross elasticity of demand for substitutes