(a)
No registered holding company shall sell any goods produced by it to any associate company thereof which is a public utility company, a mutual service company, or a company engaged in the business of performing services or construction for, or selling goods to, associate public utility companies, or enter into any contract to do so, and,
(b)
No subsidiary company of a registered holding company (including a mutual service company) shall sell any goods produced by it to any associate company thereof, or enter into any contract to do so,
at a price which exceeds the price at which the purchaser might reasonably be expected to obtain comparable goods elsewhere, or to furnish them itself, giving due regard to quality, quantity, regularity of supply, and other factors entering into the calculation of a fair price.