Restrictive trade practice means a trade practice which tends to being about manipulation of price or its conditions of delivery or to affect flow of supplies in the market relating to goods or service in such a manner as to impose on the consumers unjustified costs or restrictions and shall include-

(a) delay beyond the period agreed to be a trader in supply of such goods or in providing the services which has led or is likely to lead to rise in the price;

(b) any trade practice which requires a consumer to buy, hire or avail of any goods or, as the case may be services as-condition precedent to buying, hiring or availing of other goods or services.