Extra blogging : In future, how 3D printer will influence to our economy?

 In modern society, I heard that 3D printers are quite expensive. But in future, maybe lots of 3D printers will be supplied, and it will very normal to see 3D printers in general home. When such a day comes, many families will make things which is necessary in home with 3D printers. So some parts of economy which sells product like dish or cup and so on will decline eventually.