They aren't directly correlated, but in the past couple years, the USD price per GH/s has not dropped much below 3E-07 USD/GH/s. Right now we're at 6.85E-07. Assuming price stays flat until the next difficulty jump, that would bring us to 5.8E-07. That's elevated, but within trend for April-July. Based on the historical floor of 3E-07, price shouldn't drop below $2340 USD.