Price determines cost

"So does pricing really matter? It is not a major concern in most startups, and it is not subject to much deeper thought. Very often, the price on the tag is just the estimated production cost plus some margin. Or it is an amount that seemed reasonable after glancing at what competitors charge.
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pricing is in fact core to your business, and it is core also to succeeding as an entrepreneur. Pricing is about knowing your customer. The price you charge is what ultimately sells your product, tells a story to the customer about your business and serves as your guide for choosing your costs.
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the value, purely on the customer’s terms, that the customer expects from the product. The price must be lower than that value by some measure. Your price is the cost for the customer. The customer’s profit is the difference between the price you charge and the benefit they receive. They too want to maximize profits. Thus, a deal they cannot resist is one where their benefit by far exceeds the price they have to pay. A happy customer is a profiting customer.
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Price determines cost.
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It sounds backwards, but the price is actually determined by the value that your customers expect from the product. They buy your product if you offer them a good deal in value terms (see point one above). Frankly, the customer couldn’t care less about your cost. Your job as an entrepreneur is to profit from the price that customers choose to pay. The only way of doing this is to let the price determine the cost. Choose production process, materials and quantity produced based on the expected price, not the other way around. Cost is the entrepreneur’s primary choice variable.
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Price is set by the customer.
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Indeed, the price is not yours to set but to discover. A price that is too high will lessen sales and profits, but so will a price that is too low. The price needs to be just right. “Right” for whom, you might ask. The answer is that it must be right for the customer. The right price is based on the value the customer expects, and thus the “profit” they make from your product."

Trechos retirados de "4 Reasons Why Pricing Is the Key to Startup Success"