The slide in oil prices continued with New York futures closing Friday at $48.14, down 6 percent for the week, and London futures closing at 54.42, down 4.3 percent during the week. This time the decline was aided by an increase of 21 rigs drilling for oil in the US suggesting that US shale oil production will increase or at least decline more slowly. The decision to reactivate these rigs was likely taken a month or more ago when prices seemed to be stabilized around $60 a barrel. In addition to the increase in rigs, the now normal factors of a stronger US dollar, a contracting Chinese economy, increasing inventories, and higher oil output from Saudi Arabia and Iraq contributed to the falling prices. The prospect that more Iranian oil will be coming on the the market before the end of the year also keeps pressure on the market.