In January, root beer and orange soda each cost $1 a bottle. Judith's income is $20. She buys 5 root beers and 15 orange sodas. In February, the price of root beer falls to 50 cents, the price of orange soda increases to $2 and Judith's income remains $20, and she still buys exactly 5 root beers. True or False: Root beer is a normal good for Judith.