is that a bushel of the $8 corn or of the $4 variety of late?  At a price difference of $150+ per bag on conventional vs. stacked, with a 10-15% drop in yield in conventional vs traited, I am more likely to look at more seed options with $3 - $4 corn....the rate of diminishing returns may have been breached for traited in some areas.

My breakeven analysis calculator will be re-calibrated this year in terms of inputs and of yields to determine final plans and budget.