Mr. David is selling goods for Mr. Gross.

Mr. T"b placed a big order by Mr. David---but did not give any money yet--and is heavily relying on the goods, now Mr. David find out that Mr. T"b is a serious competition for Mr. Gross and he sees that it was a bad move, but Mr. T"b insists that he needs the goods.

Is there any "moral obligation" that Mr. David delivers the goods he promised?

Ans: according to Rema 204 end "it involves a breach of faith" although it went up in price. But many commentators agree otherwise, so either way can be considered "right"!!