Robert Brenner's Analysis of the Long Downturn

You've written a forthcoming piece about Robert Brenner and more broadly analyses that follow his lead. Brenner's account is a major reference point for for many on the Marxist left all across the board people tend to lean on his analysis of what he calls the long downturn. You write quote the puzzle is that Brenner's analysis clearly focuses on excess supply not supply constraints. How can the problem be both over capacity and under capacity explain the argument in how Brenner attempts to square that circle?