The Mac Air is cheaper on Amazon due to several factors:
• Competition between retailers - Amazon offers competitive prices due to the market competition and demand for this product.
• Bulk purchasing - Buying in bulk reduces costs and can allow Amazon to offer a lower price than other retailers.
• Shipping discounts - By using their own shipping services, they are able to reduce delivery costs which allows them to pass savings onto customers.
Overall, Amazon's combination of competitive pricing strategies results in a reduced cost for the Mac Air, making it more affordable than other retailers.