People not having a lot cash to spend is the principle purpose excessive streets battle, based on a think-tank.
Tactics such as reducing enterprise charges or taxing on-line gross sales had been unlikely to assist as a result of they ignore the issue of a weak native economic system, Centre for Cities mentioned.
It described Swansea and Newport as weak cities and Cardiff as robust.
Stronger cities have more companies that export and need higher-skilled workers, bringing wealth into the realm.
In Cardiff, 22% of jobs are in these high-skilled exporting corporations, in comparison with 19% for Newport and 16% for Swansea.
Any authorities funds to help High Streets ought to be used to develop a higher-skilled workforce, higher high quality places of work and improved transport, researchers argued, saying this is able to take advantage of distinction as a result of it helped entice companies that create well-paid jobs.
High streets of the strongest cities are more assorted and fewer reliant on outlets, with practically half of their metropolis centre companies promoting foods and drinks, and with more facilities such as cinemas and venues for the performing arts.
In Newport, the extent of locations the place you may eat is beneath 10%.
The way forward for Swansea
In Swansea, the typical family disposable earnings of its inhabitants is £14,908, about three-quarters of the UK common.
The metropolis has had varied setbacks, such as the cancellation of the electrification of the rail line from Cardiff, and the council is now driving the tidal lagoon vitality undertaking after the UK authorities determined to not again it.
There have additionally been rows over the Swansea Bay City deal.
But it additionally has two universities which have introduced ahead enlargement plans and there’s widespread regeneration underneath method and more within the pipeline.
This is “to create new leisure, office and housing that will see thousands more people live and work in the city centre and bring high-tech professional jobs to the area” the council mentioned.
It will take a few years to evaluate whether or not this funding pays off and creates the hoped-for wealth.
The report comes as analysis instructed cities in Wales had been among the hardest hit by the closure of chain retailers.
It mentioned web competitors was not the first explanation for High Street decline and metropolis centres providing shoppers one thing they had been unable to get on-line had been more seemingly succeed within the long-term.
On the flip facet, it mentioned cities with stronger economies might change into unaffordable and warned planning guidelines should allow them to construct so there’s sufficient property to fulfill demand.
Centre for Cities’ chief government, Andrew Carter, mentioned good jobs and a robust native economic system had been the important thing.
He mentioned: “Any interventions that search to enhance cities’ facilities with out boosting shopper spending energy are doomed to fail from an financial perspective.
“Policy ought to concentrate on enhancing cities’ general financial efficiency.”