basic economic law in a sentence

• Russia's new leaders cannot repeal " basic economic laws, " he said.
• They agree that the basic economic laws of supply and demand are responsible for driving up the price of crude oil and with it pump prices.
• "The lesson of the 1990s is that all nations obey the same basic economic laws, the most important of which is that what goes up must come down, at least some, " said Edward J . Lincoln, who until recently was economic adviser to former US Ambassador Walter Mondale in Toyko.
• It's difficult to see basic economic law in a sentence .