Al and Liz come into a inheritance and decide to invest the money.
Liz decides to invest the money at a Chinese restaurant involved in a feud with a neighbouring Chinese restaurant.
Meanwhile Al decides to invest the money at the other Chinese restaurant.
Both rival restaurants escalate a price war. Both Al and Liz are somehow unaware that they have invested in rival establishments and both stand to lose a lot of money.
Even for Hey Jeannie standards this is plain dumb. I mean did Liz not realise that Al is eating by himself at the other Chinese restaurant. He seems to know the proprietor for a long time.