The prices you see in your supermarket are not the true prices of products. The reason is that a lot of external effects from producing and transporting the product are not included. Examples are the costs of soil depletion, health effects on workers from the use of pesticides and environmental pollution. In true price stores you can see the true prices and make a more sustainable choice of the things you buy. The true price foundation has developed the tools to calculate and monetize societal impact.