Why are Fair Trade Schemes Beneficially and Costly?

-They can allow Long Term Planning to be Easier for Producers, as it Removes the Large Fluctuations in Price that is often seen in Primary Products -But Distorting the Market Price may lead to Overproduction. Farmers may fail to Recognise that Low Prices are a Signal for them to Grow a Different Crop. When Prices are Low, Farmers may Flood the Market and Drive the Price down Further, negatively affecting Farmers who aren't on the Fair Trade Scheme