Because demand is value and value is contribution.

Like a barber, their job is to cut off your hair. What contribution do you think they have made to the country? . .

Their contribution is to respond to everyone's demand for beauty, so that everyone can dress well, conform to etiquette and beautify their appearance. . .

Trading futures is a truth. Traders make people realize their dream of making money (of course, they are excellent traders). Isn't this a great contribution? . .

Of course, their contribution is far more than that. They also bear the risk that countless enterprises face fluctuations in raw material prices.

For example, in a bakery, what they are most afraid of is the rising price of flour, so they have to buy wheat futures to resist risks. If there were no futures traders shorting wheat contracts to create a market, the bakery would not be able to buy enough wheat futures. This also applies to steel in automobile industry, plastics in chemical processing industry and so on.