在金融词汇里,lock down,open a franchise是什么意思

题目

在金融词汇里,lock down,open a franchise是什么意思
One example refers to Jeff ’s biggest day in the market when he made $50,000.$50,000 in one day!People were flocking to the Block Trading headquarters in Houston and dropping $25,000 just for the right to lock down a city for opening a franchise at some point in the future.Block Trading is no longer around,but there are some lessons to be learned from those early days.
整段话是这样的.
dropping $25,000 just for the right to lock down a city for opening a franchise at some point in the future.这句话特别不理解.
那这整句话里是什么意思呢

答案

LOCK DOWN的意思是“锁定下来”
OPEN A FRANCHISE的意思是“开一家特许经营店”