money itself is a constraint, the fact there is only so much of it would curb over investing in production. so what ever constrains money also constraints pursuits of production that may change over time. remove constraints from money creation itself and you get what I described.
let's say we are parents looking for what I children should be and we all see doctors get paid a lot. assuming no constraints, all our children go to school to become doctors but by the time they come out, there are so many doctors their pay will have decreased significantly than they speculated. that is a coordination problem, maybe even considered 'market failure'. but in the real world there are constraints, there are only so many schools and so the price of admission will be too high, so most people doing personal economic calculation will go on to do something else. In that sense, the schools and their prices are signals that coordinate the choices of people. remove the prices, distort them through debts, and now you have removed a single constraint, distorted coordination and production, created potentially a lot of bad debts and we are back to 'market failures'.