Duh. You get what you pay for. Thus in fee-for-service Ontario the government just did the reverse, ordering doctors to see fewer patients or face penalties. But which is more "productive"?
You can't tell. Counting patients per doctor, minutes per visit, or dollars per doctor looks like feedback. But it's not, because you're just dividing one target by another. Actual value, consumer satisfaction, has no way into the system because you can't measure it.
Actually you can. As Leonard Read's 1958 classic I, Pencil noted, nobody in the world knows how to make a pencil. It may seem a humble object. But it requires wood, glue, paint, "carbon black," graphite, copper, etc., provided through a mind-bogglingly complex system in which wood is cut with chainsaws by loggers drinking coffee, shipped in trucks, painted in factories that themselves use paint and pencils and so on.
Nobody knows, or could know, how each component is made. Yet billions are made for pennies apiece because of the cybernetic miracle of prices. Nobody has to know why prices are what they are, only what they are, to make rational decisions all along the chain leading to a consumer with a limited budget deciding for herself what constitutes best value for money.