In the peak season, the shipping company will adjust it every two weeks. In addition, according to the actual quantity of goods on board. To determine the actual range. In fact, the reason is very simple. When the ship is full several times in a row, the shipping company will try to temporarily raise the price, usually 50 dollars/100. It's like a big shipping company in one step. For example, CMA, MSK and MSC will be priced in one step. If the price is not as good as expected after the price increase, they will reduce the price according to the actual situation. To put it simply, if there is more goods, the price will increase, and if there is less goods, the price will decrease.