According to the retailer's rule of thumb based on the closure principle, when a sale catalogue is created the prices (on average) of the products in the catalogue should be reduced by about 20 per cent.

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The Answer of According to the retailer's rule of thumb based on the closure principle, when a sale catalogue is created the prices (on average) of the products in the catalogue should be reduced by about 20 per cent.

According to the Retailer's Rule of Thumb Based on the Closure