Producing more stuff doesn't help if you can't sell it, and that was the problem with the US economy last quarter. The Commerce Department reported today that output rose at an annual rate of 3.6%, the best since the beginning of 2012, but final sales grew at an annual rate of only 1.9%. Not too many economists are making the optimistic interpretation. Overzealous production last quarter is likely to severely contract from the current quarter's growth, Lindsey Piegza, chief economist at brokerage firm Sterne Agee wrote in a client note.