There is a large number of buyers and sellers so nobody possesses market power.
Market participants possess full and complete information of alternatives.
Sellers produce a homogenous product.
There is costless mobility of resources.
Economic actors are price takers.
It has overlooked the entrepreneur, which is the driving force of real-world markets.
It also ignores the plan-adjustment process that characterizes real-world market activity.
How to prevent competition among its members, who will try to circumvent the agreement
How to keep new competitors from trying to enter the market
Taxation
Public borrowing or debt issue
Money creation
By creating jobs, governments would save money that would have been spent on unemployment benefits.
The increase in the number of emplyed people would create additional spending power and therefore boost the economy and tax receipts.
Increased tax receipts would pay off the initial debt.