Data on U.S. retail sales are available at the U.S. Bureau of the Census Internet site at: www.census.gov/retail/index.html. Under the heading "Monthly Retail Trade Report" there is a file titled "Retail and Food Services Sales" that lists sales by type of retailer (view “Not Adjusted Sales”). In which months are sales the highest? Which kinds of businesses experience the greatest fluctuations in monthly sales? List reasons that help explain your findings.