Market prices of corn in recent years have been falling below the loan ("support") rate. Some attribute this to the large stocks which have built up. Research evidence, however, indicates "not necessarily."
Shepherd, Geoffrey and Richards, Allen B.
"Does the Loan and Storage Program Support Corn Prices?,"
Iowa Farm Science: Vol. 13
, Article 3.
Available at: https://lib.dr.iastate.edu/farmscience/vol13/iss5/3