第二选项（复杂）是针对那些非固定不变的价格（如$24.95）。

The second option (complex) is for pricing that is anything other than a single static price (such as $24.95).

youdao

很多商人认为，一个相对价格从来不变的地方会是极乐世界。

Many businessmen think that a world where relative prices never varied would be nirvana.

《柯林斯英汉双解大词典》

无论是英式早餐还是咖啡加三明治，有一样东西是保持不变的，那就是价格。

Whether it's an English-cooked breakfast or a coffee and a sandwich, one thing has remained the same: the prices.

youdao

If the base move is 0, then the price doesn't change So that makes sense. Interesting question.

如果这个基础位移是0，这个价格就不变,这是有道理的吗，很有意思的问题。

麻省理工公开课 - 计算机科学及编程导论课程节选