Не могу понять смысл выражения "right of last refusal"

Контекст такой:
The "Preferred Supplier Status" implies, that Company A will be competitive with its suggested pricing, lead time and general support regarding any business opportunities which may occur with Company B. To do so, Company B will offer Company A a "right of last refusal" to match the most competitive bid in the bidding process for all future business opportunities.

"First refusal" я встречала, а вот "last" нигде нет(

Спасибо!

Of course, options and refusal rights can be combined, and creative dealmakers will want to do so. The Right of First Refusal and Right of First Negotiation are often combined with the Right of Last Refusal. Careful drafting by counsel is critical, however. Without it, courts have ignored "creative" approaches. Dealmakers often exclude certain transactions from these options or rights, such as parent-subsidiary transactions, bundled multiple-asset transactions, transfers upon death, transfers to trust beneficiaries, or M&A transactions.

http://www.boadweelaw.com/article-deals2.html

2 алешаBG - а заодно и в испанском попрактиковалась :)