What does that mean? People pay for it to be light out at 6 PM, or we bid on what time sunset is? What does this problem look like on a market?

And by what metric is there zero demand to solve the time-change problem?

Markets don't solve coordination problems

What are you talking about? Markets solve the distribution and valuation coordination problem by price signaling. That's the whole shtick.

Markets are a heuristic for solving some computationally hard problems. Heuristics get stuck in local optima. Overcoming local optima is presumably what GP meant by coordination problem.