1、Speculators were allowed to buy shares on margin and could even borrow from the company to do so.
公司允許投機者差價購股，投機者甚至可以從該公司借錢來購買該公司的股票。

2、And it usually involved buying on margin – that is, borrowing money from the brokerage.
而且這通常涉及憑保證金額度買進(jìn)——也就是說，從經(jīng)紀(jì)人那里借錢。

3、Chapter six introduces primary study on margin requirement in contract design.
第六章介紹合約設(shè)計保證金的初步研究。

on margin翻譯