Right. Back on track, now.
Mishnah 7 is the second-last to deal with the House-argument. (Or at least the current House-argument; there are many, many more of them.) This one talks about sales and aiding others in their work.
The House of Shammai states that one should not sell merchandise, even to a non-Jew, if there isn't enough time for the person to return home. He also prohibited loading up a donkey for another or even aiding him to lift a large burden onto his shoulder - again, if the person lives a distance away and won't be able to get home before Shabbos begins.
The House of Hillel allows one to do the above, provided the person is off one's own property by the time Shabbos comes in.
That last reminds me of a story I once read, about a Mr. Faiglin in Australia.
Mr. Faiglin was one of the founding members of a Jewish farming community in Shepparton, Victoria. He eventually became a large enough mover of produce that he started his own cannery by name of SPC. (Shepparton Produce Canning or some such; they are now a national company that exports overseas as well.)At one point, the Premier of Victoria was reminiscing about his own early life in the same city. He remembered visiting Mr. Faiglin once on a Friday afternoon to ask for some empty fruit crates. Mr. Faiglin's answer was, "You can take as many as you want so long as you and your truck are out the gate by sundown!"