But this theory, in my understanding, claims that more sales is NOT = more profits. Even contrary, if sales are increased due to automation rather than human labor intensification. There are claims that the average US companies profit rate steadily fell during the second half of 20-th century. Mostly due to competition which forced companies to lower prices and increase automation. However in 2000-s the profits started to grow again as US companies increased manufacturing outsourcing to the countries with less automation and cheaper labor force.
The US rate of profit 1948-2015 – Michael Roberts Blog (wordpress.com)
However there also could be some attempts to hide profits for tax evasion.
Thus according to this theory the most profitable enterprise is the most labor intensive and least automated.