Johnny Lingo.

Johnny Lingo, one of the sharpest traders in the south pacific islands decides to bargain for a wife, and offers a record price of eight cows for Mahana, a plain girl who shuns contact. This causes quite a sensation on the island. A year later Johnny and his wife return for the first time since the marriage, and all find that something miraculous has occurred to Mahana. Johnny explains that by paying eight cows he proved that she was worth more to him than any other woman on the island. He gave her a great gift, that of self-worth.