How did the Aztecs create wealth from nations surrounding them?

Do children become more an economic burden than economic benefit as the subsistence base shifts from agriculture to manufacturing? By the late 1940s the US produced of all the economic output in the world.? What are four factors that affect elasticity? How can one determine fixed costs if they are not provided? What are the Advantages of a Paternalistic Leadership Style? How did speculative investing weaken the stability of the stock market? Individual income tax rates are usually this of tax the higher the income the higher the tax rate? How does an airbag inflate? When does a trade considered as a favorable balance of trade and unfavorable balance of trade? What is economics of production? Is managerial economics is the integration of economic theory with business practice for the purpose of facilitating decision making? Why was Richard Arkwright such a successful business man? What led to the economic depression of 1873 in Britain? What is the value of a series 1928 100 dollar bill with redeemable in gold and pay to bearer on demand with a green seal? What is the definition of subsistence farming? What is the meaning of cash crop? Advantages of a fixed rate of exchange? If two bonds have the same maturity the same yield to maturity and the same level of risk the bonds should they sell for the same price regardless of the bond's coupon rate? Why did Bismarck create a cradle to grave society for workers in Prussia? How can you apply economics in daily or weekly allowance?