katherine thompson whose group investigated it said they will be among first to benefit. >> cement and concrete companies. if you look at that, one of those companies and would benefit is actually a mexican based company. other major beneficiaries would be materials, martin marietta materials. >> thompson knows granite construction which has projects along the border and steel makers that produce rebar are well positioned. and not just for a wall but for broader infrastructure spending as well. other prospective winners, caterpillar and deere. about a third of the 2,000 mile border has already been cordoned off thanks in part to the defense act of 2006. and many miles just aren't conducive to a structure thanks to local terrain. that could mean more demand for surveillance technologies, making defense contractors winners as well. the israeli firm is already developing a wall in air air and boeing has developed and operated border surveillance in the past. but much remains to be seen, including the price. trump has said could it take $8 billion. but some experts put the cost as high as