Pubco claims that the tie offers low cost entry into the trade have been "blown out of the water", according to anti beer tie campaigners.
The Fair Pint group welcomed the findings of the Business & Enterprise Committee report which it says "comprehensively addresses the problems caused by the tie."
Fair Pint's Brian Jacobs, who gave evidence to the Committee, said: "It is now for the government to respond urgently to the report's recommendations and investigate the rent review system.
"It must also refer the operation and inequity of the tie to the Competition Commission without delay."
He added: "We believe that the 'pubcos' argument that the tie offers a low cost entry system into the pub sector has been blown out of the water by the report's findings on rents.
"It also shows that many tenants only take on a tied lease because of the difficulties of finding a free of tie pub."
Meanwhile, the Campaign for Real Ale (CAMRA) has called for an independent economic study into the operation of the beer tie by the Office of Fair Trading before a Competition Commission investigation.
Chief executive Mike Benner said: "While the issue of the 'beer tie' needs to be assessed to ensure fairness to all parties we are not yet convinced of the need for a lengthy Competition Commission investigation.
"A two to three year investigation would create huge disruption and uncertainty for the UK's pub owners, licensees and consumers. A lengthy investigation may also serve to delay urgent action to deliver fairness to struggling pub licensees and their customers."
Trade union GMB responded to the report by writing to all Punch Taverns and Enterprise tenants and lessees in a recruitment drive and said it will campaign for fairer deals for licensees.
GMB general secretary Paul Kenny said: "The Select Committee clearly recognizes that the problems about the imbalance of bargaining power between the pubcos and their tenants will remain regardless of any reference to the Competition Commission and the outcome of that reference. This is welcome.
"GMB members who are tenants have concluded that the only answer to this imbalance is the traditional one of combination and collective bargaining to secure a fair deal."
He added GMB would organise "collective legal challenges to the pub companies, lobby government and represent individual members in dispute with their pub companies."
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