Governments should not interfere with the prices and relations established between traders across borders. Yet Vitoria's greatest contribution was producing gifted and prolific students. They went on to explore almost all aspects, moral and theoretical, of economic science. For a century, these thinkers formed a mighty force for free enterprise and economic logic. They regarded the price of goods and services as a consequence of the actions of traders.
Prices vary depending on the circumstance, depending on the value that individuals place on goods.
The price of goods and services are a result of the operation of these forces. Using reasoning, Navarrus was the first economic thinker to state clearly and unequivocally that government price-fixing is a mistake. Navarrus was also the first to fully state that the quantity of money is a main influence in determining its purchasing power. For a currency to settle at its correct price in terms of other currencies, it is traded at a profit, an activity which was controversial among some theorists on moral grounds. But Navarrus argued that it was not against the natural law to trade currencies.