Sally eats at the local burger restaurant. Suddenly the restaurant lowers its prices. A - In response to the low prices of burgers, Sally reduced her visit to the pizzeria. Can we know from this whether pizza was a bad product for Sally or not? B - Suppose instead that, in response to the drop in burger prices, Sally goes to the burger restaurant a lot Explain how this might happen in terms of income and substitution effects (using the concepts of normal and inferior goods)?

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