More than $1.5 billion has been spent on the $1 billion border fence proposed by the U.S. in northern Arizona.
But new research suggests the new design would be less cost effective than other alternatives.
It also found the design would not reduce crime, but would instead lead to a higher number of illegal crossings.
The research is the latest to suggest the border fence is a bad idea.
The Trump administration has repeatedly proposed a new design that would cost far more to build than other options.
But the new research indicates the cost of building the border is more expensive, and it’s less likely to lead to fewer illegal crossings than other models.
The border fence has been controversial since it was announced in late August.
The U.N. estimates that the U,S.
has committed $8.7 billion to building the $10 billion border wall.
But critics say it’s just another project that has not been well managed.
They say the U is paying for a project that should be done by the private sector.
The new research shows the U will be far more expensive to build the border wall than other approaches.
The analysis by the National Academies of Sciences, Engineering and Medicine (NASEM) and the University of Arizona says the current border wall could cost $2.6 billion to $3 billion to construct.
It’s more expensive per mile than other designs and will also require more construction equipment and personnel, which could create long-term problems.
“While the costs associated with a border fence are expected to be relatively small, the current cost structure is not sufficient to support the total costs of the proposed border fence,” the researchers wrote.
The study looked at more than 400 designs, including prototypes, and found the U has spent nearly $1 trillion on the project.
Of that, $1,639 billion has gone toward the construction of fencing, with the rest of the money going to land acquisition, security, security fencing, customs and border security, and transportation.
The researchers calculated that the cost per mile for the current design is $7.2.
But they said that cost would increase with more fencing, so that a 10-mile border wall would cost $10.6 per mile.
The cost per foot of border fence fencing would also increase with fencing.
The most expensive fence, with a projected cost of $6.8 billion, would be the one in San Diego, where it would be built by contractors.
“We did not find a statistically significant increase in cost over other alternatives,” the authors wrote.
“Cost estimates were limited to construction costs of $3.9 billion and construction costs per mile were estimated at $7,819 per mile.”
The research, published in the journal Proceedings of the National Academy of Sciences on Thursday, found the current construction cost of the fence is “significantly higher” than other fences.
The current cost per kilometer was $2,039.
Another fence design, the $6 billion “super fence” in San Jose, California, has a similar cost per square foot as the current fence, according to the research.
The project cost per km2 was $1 million per kilometre, while the current project cost is $5.3 million per km.
But that is less than the $7 billion cost perkm, the researchers said.
“In this study, we compared the cost to other alternatives for the cost-benefit analysis and found that the proposed super fence would cost significantly more to construct than existing border fences in most areas of the U., and would require significantly more equipment and staffing than the existing fence,” they wrote.
Some experts are skeptical about the cost estimates.
They said the costs are not accurate.
The report says the cost could be higher if fencing were to stretch into urban areas, which the researchers say is likely.
The other barrier to the fence, the border, is estimated to cost $3 trillion to $4 trillion to build.
The experts said the U could build a border wall with the money the federal government spent in the last few years on border security and customs enforcement.
“A border fence that is as good as the one proposed by President Trump could be financed with federal funds in a cost-effective manner,” they said.
The authors also said the current estimate of the total cost of a border fencing system is likely much lower.
The total cost per m2 is $4,836, which is lower than the current $5,564 estimate.
The $1-million cost per metre of fencing is $3,800, which means the cost is lower because the cost will be lower if fencing is not extended into urban or rural areas.
But even that estimate is “substantially higher” in urban areas than in rural areas, the authors said.
And the study found that in the Tucson area, where the current fencing is in place, the average cost per hectare of fencing was $6,000, compared with $3 per hectale for