أنشئ حسابًا أو سجّل الدخول للانضمام إلى مجتمعك المهني.
Everything. You can even outsource the core of your business, although that is rarely a good idea.
For example, if both the first and second manufacturers of widgets are hopeless at marketing, you could set up a business which sold widgets. Outsource widget manufacture to the second company (they'll be glad of the work) and marketing to an excellent marketing agency.
