They lied to you. The most valuable material in the world is not gold or diamonds and stuff. It's ink.
Look, I type a '1' on my computer, think a bit and then add some noughts, think a bit more and add some more noughts until it looks about okay.
I call my pal, a banker wheel, and tell him as I would a piffling kid, "Hey Allie, or Bernie or whoever, you've been chosen to be blessed. I'm sending you over some money. You'll find it in your account. It's genuine. And just remember my interest, eh?" and, like it's Happy Hanukkah, "Look in your account." Then I slap the 'send' button on my computer. Whew, this work!
Allie, or Bernie or whoever looks in his account and he sees the numbers written in genuine ink, not your falsified stuff, and he believes, and says "Wowie, thanks, O Jakey, you and G-d be praised, and I mean that."
Because of the laws they made a few hundred years ago to stop bankers from being too provident and expansive, this now lets Allie, or Bernie or whoever say to his many banker friends, "Look, forget this chicken-and-egg garbage, you can have some money, but just you remember to pay me my interest on time, got that?" And he legally lends out to the bankers nine times the amount I sent him. - It costs us a lot of ink to get and keep that 'legal' tab stuck on there, I'll tell you. - And all these bankers see this miraculous genuine ink in their accounts and say, "Wowie, O Allie, or Bernie or whoever, you and G-d and proliferation be praised."
Now these bankers have many friends who have organizations called corporations, which means they don't have to pay taxes until they want to pay taxes if they want to pay taxes, and being corporations gives them the use of this money to play with until or if then. So these bankers say to their corporate friends, "We've decided to let you have that loan you're always wanting, so just look in your accounts, and let's just don't forget our capital and interest." And in obedience to the foresight of those who went before and had the authority or the financial muscle to make it a law - again inscribed in genuine ink - that they could, these bankers also lend out nine times the amount that they have received from Allie, or Bernie or whoever's bounty.
And the corporate friends all look in their accounts and see the numbers in this genuine ink, and they say, "Wowie, we've jointly and severally got it made."
Then they call up the various bosses of their many companies and tell them, "You can have some more money for those projects, but just you remember to come up with some better profits this time, and make it snappy, eh? It's the bottom line that counts, and only the bottom line, got that?"