If Blankenship Enterprises has to switch suppliers in the middle of a large production run, the company will not show a profit for the year. Ttherefore, if Blankenship Enterprises in fact turns out to show no profit for the year, it will also turn out to be true that the company had to switch suppliers during a large production run.
The argument fails to establish that a condition under which a phenomenon is said to occur is the only condition under which that phenomenon occurs is the reasoning in the argument that is most vulnerable to criticism.