Try to find the average market price before you sell something.
This clues you in on what customers are willing to pay for your product or service.
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Use the internet to your advantage, and as a marketing tool.
Build a website, or if you are unsure how to do this you can pay someone to create a site for you.
Build a website, or if you are unsure how to do this you can pay someone to create a site for you.

You may be tempted to allow customers some financial slack in the beginning of your relationships with them, however this can pose a potential threat to your profitability.