By Ben Dickey The economy expanded at an upwardly revised 4.2% in the second quarter. This is a good sign after the first half of the year averaged less than 2% growth. Since the dismal first quarter, the economy seems to be improving. Some of the second quarter gains were due to pent up demand from consumers who stayed home during the bad weather in the first quarter. As they came back into the economy, businesses expanded their inventories which also added to the second quarter growth. Additionally, our exports grew more than our imports during the quarter. Are we finally seeing the acceleration we have been waiting for? It is too early to tell. As is the case most of the time, there is evidence of growth in the U.S. economy, which is getting a big lift from the domestic energy boom. There are also potential problems.