What has determined the price of Honus Wagner's baseball card over time? A new supply of Honus Wagner cards are produced every year to stimulate demand in the market. As wealth has increased among baseball fans, demand for the card has decreased. Supply has remain fixed. With a fixed supply, demand solely determines the price. As incomes have increased among baseball fans, demand for the card has decreased. Supply has remain fixed. With a fixed supply, demand solely determines the price. As incomes have increased among baseball fans, demand for the card has increased. Supply has remain fixed. With a fixed supply, demand solely determines the price