Perhaps the best known types of cooperatives are agricultural co-ops, in which members help decide what produce is grown and how it's sold. You've probably heard of a handful of them — including Welch's, Land O'Lakes, and Ocean Spray. Many of the products you see in your grocery store isles may be the result of a co-op. In fact, grocery store co-ops are fairly common as well, with members deciding what is sold and at what price point. REI is another extremely well-known co-op, proving that a consumer cooperative in the retail industry can be highly successful. While not as well-known, other common types of co-ops include housing cooperatives, in which you get a free unit by buying a share in the co-op that owns the property, and electric co-ops, which offer affordable power to a community.