1. A manager is under contract for a year at $3,000 a month
2. to manage the production and sale of a company's Christmas line of goods.
3. In November, at the most crucial time, he goes to the boss and says,
4. Boss, one of your competitors has offered me $4,000 a month if I leave
5. and come to work right now.
6. The boss is desperate not to lose this man, just
7. like the manager at the factory, the cannery in Alaska.
8. He said, I'll tell you what.
9. I tell you what we'll do.
10. Here is your contract and my copy of it with both our signatures on it.
11. I'll tear the signatures off my copy and you tear them off your copy
12. and then we'll sign a new contract at $3,500 a month.
13. That's what they did.
14. And come February, the quiet time, the boss
15. fires this man-- remember it was a contract for a year.
16. We don't have a deal.
17. There is no bargain, he says, because you were already bound to work for me.
18. And you can't sell the same thing twice.
19. Maybe he had read about the Alaska cannery workers.
20. So the man that is fired sues the boss for his job.

wht is difference in these cases i m unable to understand