If a variety is not done well, you don't have to think about doing anything else. Even if you get something occasionally, you will soon lose it. This is not to criticize what's wrong with making several varieties at the same time, but to make multiple varieties is more energy-consuming than making one variety, and it is certainly not impossible.
Some people may say, if you haven't done it before and are unfamiliar with all varieties, which one should you do? My answer is to make "corn" first, and then consider making varieties such as soybean meal.
If you only make one variety, this variety will have a chance to make great profits when it goes on the market, but when it has no market, it will also experience more difficulties. For example, if you trade PTA in a single variety, it will be amazing before 20 15, and you will doubt your life from 20 15 to 20 18.
All varieties can smooth the curve and accumulate income. The east is not bright and the west is bright, and it has a strong ability to resist risks. However, the explosive force of lack of profit can only break out when most varieties on the market are listed at the same time.
People who choose varieties wander between the two, in the middle, trying to balance the explosiveness of income and the smoothness of curve. But because of the uncertainty of the trend, are there no markets for the varieties he excluded? The answer remains uncertainty. It may give up the big bull market of PTA or the big bear market of other varieties.