Why is there such a big difference in price between power supplies?

A Related question can be asked about automobiles. Both questions have the same answer: there are many factors at play and a simple answer is probably not possible. Many of the factors are:

Marketer name and reputation
Design of the power supplies
Number and type of competitive units
Certifications (such as safety, EMI, etc.)
Dependability of the design
Quality of components used

One thing to talk about while evaluating a power supply (or any equipment) is the total cost of ownership. Include the cost of yearly calibrations and any estimated losses due to unavailability or having to repair or replace the unit if it fails. Over a decennary or more, these costs can easily pass the original cost of the power supply.

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