Schmoo and Froo are fictional goods. Suppose that when your income increases, your demand for Schmoo decreases, but your demand for Froo increases. What can we necessarily say about Schmoo and Froo? O Schmoo is an inferior good, but Froo is a normal good O Schmoo is a private good, but Froo is a public good O Schmoo and Froo are complement goods Schmoo and Froo are substitute goods