This was a really good teardown. http://www.righto.com/2015/11/macbook-charger-teardown-surprising.html http://www.righto.com/2015/11/macbook-charger-teardown-

This was a really good teardown. http://www.righto.com/2015/11/macbook-charger-teardown-surprising.html http://www.righto.com/2015/11/macbook-charger-teardown-surpr... The author also does consider the cost of the components.