Taxes on products are taxes that are payable per unit of some product when it is produced, delivered, sold, transferred or otherwise disposed of by its producer. Subsidies on products are subsidies that are payable per unit of a product when it is produced, delivered, sold, transferred or otherwise disposed of by its producer. Subsidies on products can be considered as negative taxes on products. Taxes less subsidies on products are elements between purchaser values and basic values.