The main reason is that shipping containers are not being sent back to China and other major production countries naturally.
In years prior, China took a lot of low grade plastics back for recycling, which caused shipping containers to naturally make their way back to China. However, they stopped that program in late 2019/early 2020. As a result, shipping containers are having to go back to China empty. This essentially means that the cost of shipping something out of China also now involves the cost of importing a shipping container to China.
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