This month, we're devoting Marketplace Money to the basics — topics like banking, investing, and credit. Saving is probably the most simple concept in personal finance. There's no algorithm. No elaborate jargon. Just take a portion of what you earn and put it aside. But that's the finance part of it. The personal is where we run into trouble. This week, how we save, strategies on savings and more. Plus, we take a global tour from Beijing to Brazil to Britain and back home to see how different cultures approach saving cash. And, how did the piggy bank become the icon of saving?