Mathematics is indeed quite important, but if you ask about factories, it will relate to human resources, where there are many workers that can be accommodated, investors will always build factories there. ofcourse mathematics also plays a role here, but in relatively small portions
Mathematics is the basis for business decisions and many other things, indeed the effect is not that big, but the basis of many decisions taken by the state and investors is accurate calculations, mathematics does not play a visible role, but every calculation in a decision is where mathematics lies. I admire China which is able to develop its country into a country with a very large economy, I believe that many people in China are very good at mathematical calculations, so I think this has something to do with it.