(1)机遇购买
指在货物买卖合同中，买方购买的是取得标的物的机会。无论买方是否取得标的物,他都必须支付固定的价款。通常的例子如购买彩票，彩票即为买主提供了获得奖品的机会。

(2)预约包购(=emptio rei speratae)

• Iniquum est ingenuis hominibus non esse liberam rerum suarum alienationem.
• in issue
• initial appearance
• initial carrier
• initial determination
• initialia testimonii
• initial notice of loss
• initials
• initiated law
• initiation fee
• initiative
• in itinere
• iniurcolleguia
• in jeopardy
• in judgment
• In judiciis，minori aetati succurritur.
• in judicio
• In judicio non creditur nisi juratis.
• injunction
• injunction against suit
• injunction bond
• injunction pendente lite
• in jure
• injure
• in jure alterius