We Human beings citizen of different countries require money to fulfill our needs. Money which has been evolving from centuries is a form for meeting the end needs of human kind. Where as in old days people were exchanging goods for goods to cater .
A professional graphic designer will create your logo in Illustrator, not photoshop. please make sure when you purchase a logo you are receiving a VECTOR format of your design, a PSD layered file is not the correct logo format.