If one Party decides to open a PI/PSA scheme in its own nation, the other Parties must be kept abreast of the situation through the PCG and MMG, particularly as implementation of market support measures could potentially have unintended consequences for other Parties. 72. When the appropriate authority buys product into PI, they must make regulations setting out the buying-in prices for the products and the quantitative limitations where buying-in is carried out at a fixed price. 73.