The good thing about a dealer's derivatives portfolio is that it is marked to market.

In the 1987 stock market crash, according to the conclusions of the official Brady report, colossal sales of stock index futures by so-called portfolio insurers - whose investment strategies depended entirely on these derivatives - greatly exacerbated the 500-point market decline.

The options and futures traded on exchanges are derivatives contracts.

Politics is a good thing!

Caffeine is a good thing.

There is no harm in repeating a good thing.