1) The drop in prices could be a signal that people aren't creating stuff which could be a slow down in growth, 2) It's difficult to quantify the impact the oi

1) The drop in prices could be a signal that people aren't creating stuff which could be a slow down in growth, 2) It's difficult to quantify the impact the oil and gas boom had as a percentage of global GDP growth and therefore what the impact will be in its absence.