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Economic Lessons - Consumer Influence on Price

Have been reflecting on some economy principles and rules for a while and here's what still doesn't came through to me in regard to Supply and Demand equilibrium and price results:

How do consumers influence the price? Say when we come to the grocery store or a super market we don't bargain, right?
Also with big purchases like furniture, expensive electronics, cars or real-estate we don't do many of those frequently enough to influence the price. There is another part of economy - B2B where "consumer" or one side of the relationship sometimes can influence the price and sometimes can't. Very often in case of businesses the procurement decisions are not made by one person and not always fair or economically efficient.  Or I am missing something here?

I just thought the Demand part of this system should "belong" to the consumer, hence the idea that the buyer should influence the equilibrium somehow. However, to me usually the consumer has only got an option to accept the already set price.

Would really appreciate any useful comment on that, because it has been something I thought about for a while now.

It appears that in different areas of economy customers have different levels of influence or no influence at all in some cases.
Here's one example Supply and Demand Pricing Rules for Property Market


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