13. which of these factors hide economic problems in the 1920s? (1 point)investors lost confidence in the market. farmers sold crop surpluses to pay off their debts. americans purchased many consumer goods on credit. wages increased at the same pace as worker productivity. 14. farmers contributed to the problems that led to the dust bowl by (1 point)putting down new layers of topsoil. moving off of the plains to find new farmland. damming western rivers and using irrigation techniques. using intensive farming practices that removed protective grasses.