 Complete the following phrase:  Tackling this problem at its roots is all but simple, and social mix policies can break up populations seen as difficult by redevelopment. This has not had the hoped for results. It has also been sought to resolve the problem of access to the system by disadvantaged people by a new system where certain groups can apply to court to be housed if refused, the right to housing. This tends to intensify the controversy over social housing allocation, who should be housed. The French tradition of universal social housing allocation  housing for everyone is called into question by EU competition law restricting subsidy except for the disadvantaged. In any event, the system is certainly effective in producing construction, although not with the excesses seen in the 