The total amount of a product available in a market at a given price is called the supply.
There are a lot of factors that affect supply such as the price of the product, price of similar goods in the market, price of inputs, and the number of suppliers.
Answer: FEDERAL INCOME TAX
Explanation:
The most likely tax that follows the principle that states that people should pay based on their ability is the federal income tax. This tax is progressive as the high income earners pay a higher percentage as tax when compared to he low income earners.
The sales tax and doctors license fees aren't progressive, as the rich and the poor all pay same amount. This doesn't align with the principle.
Political differences created distrust among the Whites and prevented them from cooperating effectively with one another, some Whites insisted on restoring the czarist regime, others believed that only a more liberal and democratic program had only chance of success, and the Whites, then, had no common goal. The communists, in contrast, had a single-minded sense of purpose.
hope this helps ^-^