round-tripping, also known as round-trip transactions or "lazy susans", is defined by "the wall street journal" as a form of barter that involves a company selling "an unused asset to another company, while at the same time agreeing to buy back the same or similar assets at about the same price." swapping assets on a round-trip produces no net economic substance, but may be fraudulently reported as a series of productive sales and beneficial purchases on the books of the companies involved, violating the substance over form accounting principle. the companies appear to be growing and very "busy", but the round-tripping "business" does not generate profits. growth is an attractive factor to speculative investors, even if profits are lacking; such investment benefits companies and motivates them to undertake the illusory growth of round-tripping.