The study looked at Chinese manufacturing firms from 2005 to 2007 to see if exporting helps them become more productive. They found that firms that export have higher productivity and grow faster than those that don't. However, this only applies to firms that are good at innovating. If a firm isn't good at innovating, exporting might actually make them less productive. So, exporting can help some firms grow, but only if they are good at coming up with new ideas.