I did not know about that word before living U.S.
I thought it was bad word for business scene like recession.
But it means all shop move into black,they achieve a budget surplus.
Our family I and my wife went to shopping by rotation.
At first my wife get up early morning at 4 a.m. o'clock and she went to Boise mall.
After breakfast we family went to furniture shop and Costco.
I bought blueray DVD player. Blueray has same regional code between U.S.A. and Japan, so I can use it in Japan!?