With a $7,500 loan from a family member, Calvin Gorelick has started an online business selling specialty yoga blocks. His primary concern is whether or not the cycles of "purchase blocks, sell blocks, receive money, make loan and other necessary repayments" will allow his company to remain financially solvent. Coupled with the cash flow issue, Gorelick has noticed disturbing sales data in his first month of doing business: with each passing week, his sales drop. Although he has just a small data set, Gorelick is worried. Is this the beginning of a trend, a one-time drop in sales that will level off, or only garden-variety variability that will average out to an acceptable level of sales?