Chris - the acronym is "BOGOF" - don't think I didn't notice your disrespectful comment.
Sales promotion such as this has nothing to do with forced cross-subsidy, because both are part of the same accounts. Cross-subsidy by contrast takes money from one person't account and puts it into someone ELSE's pocket.
Chris - "borrowing for growth" involves borrowing capital to construct something that will itself pay for the cost of borrowing and in addition generate valuable output, hence create economic growth.
Borrowing simply so that you can spend money today that you don't currently have is not "borrowing for growth" it is more like spending the company's pension fund to buy the CEO a luxury yacht.