Dwindling sales are likely a function of two things, a worldwide shortage of microchips that have shuttered many automobile factors and possibly higher prices are creating demand destruction among buyers. Over the last year, dealership inventories have been tight due to supply chain difficulties and forced dealers to reduce incentives and discounts to prospective car buyers. Incentives were only 5.2% of the average transaction price last month, compared with 10% a year ago. Another issue for buyers is the staggering increase in used cars, which hit a
record high last month. 
Fewer cars were sold last month, but prices continue to hit record highs that may suggest consumers are becoming discouraged to buy because of affordability issues.