Economies of Scale
In many industries, as output increases, the average cost of each unit produced falls. One reason is that overheads and other fixed costs can be spread over more units of output.
Roger Garrison - Macroeconomics of Capital
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NOVEMBER 23, 2012 by MAX BORDERS
As long as it's peaceful, shop wherever you like. That includes buying local, "shopping small," or buying materials and making your own gifts. But please: don't feel guilty about holiday shopping at a big box. A lot of people are selling fallacious thinking. Events like "Shop Small Saturday" can be just another form of rent seeking.