To set the price necessary to spread out the concept of "price" on the economic pillar. Structurally, the price of each item is the sum of all of your costs:
• related activities (rental, taxes, utilities, salaries, etc.);

• costs for the purchase of goods for resale;

• also contains a certain percentage of the profits that you expect to receive.
Thus, if you manage to sell a certain amount of product at a given price for the month, then the month can be considered commercially successful.
Then you should define the margin. If we continue our example from trade, the margin is a premium to the price of purchase of each item, through which you will be able to pay the associated activities costs and make a profit. In practice, the retail trade was some average indicators of the value markups that depend on groups of goods:
• The average markup on food is 25%;

Mark-up on clothes and shoes – 50 to 100%;

• The mark-up on small Souvenirs, and jewelry from 100%;

• Markup on auto parts is in the range of 30-60%.
Knowing these figures, you will be able to set a price for your product, the relevant market.
After the first month of trading keep all your expenses and incomes in a single report for yourself. If you were able to realize planned volume at a good price, to pay all costs incurred and to let small, but the profit calculation was performed flawlessly. If to achieve the planned results did not succeed, analyze the cause and you may slightly reduce prices and will be able to find what can be done differently and more efficiently.