Donald J. Trump may rail against Wall Street and business elites at his campaign rallies, but that has not stopped him from turning to many of them for economic advice. On Friday, Mr. Trump announced his economic team, just days before he is expected to give a speech in Detroit on Monday about what he would do to improve American growth.

The 13-member team — all men — includes several billionaire bankers and investment managers, and even a part-time professional poker player. Many have been in business with Mr. Trump before. Having such moguls on the team not only expands Mr. Trump’s network of Wall Street donors and contacts, but may also reassure the financial community that it need not be too alarmed by some of the candidate’s populist oratory. Even so, several of those named often have expressed views against the economic mainstream, voicing suspicions about the Federal Reserve and global trade deals.

“They certainly can provide many useful insights, assuming Trump is willing to listen to them – it’s just I would like to see more diversity in terms of expertise and background,” said James Pethokoukis, a commentator at the conservative American Enterprise Institute. He noted that the group was heavily weighted toward developers, hedge fund managers and bankers, with hardly any representatives from Silicon Valley or academia. “I’m not sure how well the expertise on that list really matches up with some of the challenges facing the American economy.”

Kevin A. Hassett, an economist at the American Enterprise Institute, was also surprised at how few economists were selected. “Most campaigns tend to balance academics with business folks, like those on this list,” he said. As for whether the advisers will wield much influence, Mr. Hassett said, “It is pretty common for campaigns to have a long list of well-known business leaders who act as ‘advisers,’ but there is a large variation in how active they really are.”