This isn't necessarily so clear cut. Some percentage of market activity due to speculation helps to smooth capital flows over time. In an industry like fishing,

This isn't necessarily so clear cut. Some percentage of market activity due to speculation helps to smooth capital flows over time. In an industry like fishing, profitable speculation can keep the industry afloat in tough times (e.g buying up fishing debt in a slump for pennies on the dollar because you know the fish are still there and this was just a bad season) or damp down an overheated and unsustainable market (e.g. shorting fishing futures).