Campaigners for fair trade say big companies don't pay a fair price for the cocoa beans and keep too much money from the chocolate they sell.
Because so many people grow cocoa around the world, the companies can look for ages until they find the lowest price possible.
Paying a fair price
They are able to offer much less money than the farmer wants for their crops because of the farmer doesn't accept the price on offer, the companies will take their business somewhere else.
Fair trade companies make sure they pay the farmers enough money to earn a living after covering all their costs.