An article in the Wall Street Journal discussing the nickel market contained the following:

The sharp rise in nickel prices demonstrates how even a slight shift in demand and supply can roil tiny commodity markets like those for nickel, orange juice, and cocoa.

a. What does the article mean by a market being “roiled”?

b. Given this information about “tiny commodity markets,” would it be more or less valuable for participants in these markets to have futures contracts available to them than it would be for participants in larger commodity markets, such as the market for oil?