If you can’t sell your schar, then what is a “Yissochor-Zevulun” partnership? Isn’t that where one guy gets the bucks and the other guy learns, and they split cash & schar?
(And any random bloke can make a ????? ?????? partnership; I have seen the text of such an agreement written by R’ Isser Zalman Meltzer zt”l, who praised the idea very much.