'Team of economists': singular or plural? [duplicate]
Solution 1:
It depends on whether you want British or American English. "The team are" is perfectly common and acceptable in British, whereas "the team is" is by far the more common construction in American.
Solution 2:
Just leave out the team: "Our economists are at your service..." I think your intended market of possibly economist-hiring individuals is likely to be reasonably well-educated and put off by careless grammar. That's the only grammar police you need to be worried about.