The correct answer is: The market or marketplace.
Normally you visualize the market as a physical place were you can go and buy food or something else. By doing that you become a buyer and the person you give the money in exchange for products becomes the seller. In economics that doesn't specifie the physical place, it is an "arrengement where buyers and sellers come in close contact with each other directly or indirectly to sell and buy goods.
Answer: The sun
Explanation: Everything revolves around the sun in our universe. The other answers also do not make sense.
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Several theories attempt to explain how pyramids were constructed, but for now, the mystery has yet to be solved. One theory suggests that causeways were used to haul the stone blocks on wooden sleds up the side of the pyramids. The ramps were lubricated with water to reduce friction when hauling the blocks. And that the Egyptians used different tools to build the pyramids including copper pickaxes and chisels, granite hammers, dolerite, and other hard stone tools.