NEW YORK ( TheStreet) -- "We're entering a no-trading zone next week," Jim Cramer told the viewers of his "Mad Money" TV show Friday. He said it's impossible to make money during earnings season, when the news break too fast and leaves no time for the homework that leads to wise investment decisions. Cramer told viewers to listen and learn, but keep their powder dry. Among the many companies Cramer said he'll be watching next week will be Alcoa ( AA). Cramer said he's curious to hear about this company's energy costs.