In December, the trade deficit shrank by 20.7 percent to $38.5 billion.
Reuters' Jamie McGreever noted that this was the third largest month-over-month swing in history.
Economists expected the deficit to narrow to $46.0 billion.
Much of this shrinkage was due to a huge decline in energy
From TD Securities' Millan Mulraine:
The main driver for the sharp improvement in the deficit was weaker import demand, as the pace of total imports declined 2.7% m/m in December. Domestic demand for imported goods were weaker across the board, with imports of industrial supplies (down 6.9% m/m) particularly weak, adding to the 3.7% m/m drop in auto imports. Petroleum imports were also lower, as both lower energy prices and imported volumes pushed the imported energy bill lower.