Versions of s. 50(1)(a)

is a party or privy to, or assists in, any sale that discriminates to his knowledge, directly or indirectly, against competitors of a purchaser of articles from him in that any discount, rebate, allowance, price concession or other advantage is granted to the purchaser over and above any discount, rebate, allowance, price concession or other advantage that, at the time the articles are sold to the purchaser, is available to the competitors in respect of a sale of articles of like quality and quantity,