TAX, COST THAT FARMER PAYS TO SELL HIS PRODUCE

HI My question here is when a farmer needs to sell his produce then he go to mandi there he takes his produce in a vehicle so he needs to give transport charges then there his produce sold at whatever cost he goes to the buyer's godown and there comes a issue that I am talking about so farmer needs to unload his produce to seller's godown and there labors takes charges from farmer apart from this they(LABORS) work Aggressively and grains spills but farmer tolerate and see his loss at last he has pay the unload cost to labors before receiving his money from buyer. WHY??? HOW IS THIS SYSTEM where in mandi farmer has to bear all the charges...