The slick promotional publication, titled “Peace to Prosperit y,” described a $50 billion investment surge in the Palestinian economy over the next decade, like a fantastical New York real estate promotion. Palestinians certainly could use the investment and jobs in their economically depressed communities, where unemployment last year was 31 percent.

The publication touted what was supposed to be an economic foundation for peace between Israel and the Palestinians, presented at a conference in Bahrain this week by Jared Kushner, presidential son-in-law, senior adviser and, formerly, New York real estate developer .

Mr. Kushner invited participants to “imagine a new reality in the Middle East.”

But except for its patronizing tone, there’s little new about the plan, which relies heavily on the construction of much-needed infrastructure projects that are retreads of proposals the World Bank, the United States and others made in previous failed peace efforts.

The most ambitious undertaking would be a $5 billion transportation corridor from the West Bank to Gaza that could link the two Palestinian territories with a major road and possibly a modern rail line. To facilitate the flow of Palestinian people and goods with Israel, Egypt, Jordan and other countries in the region, facilities at key border crossings would be upgraded, new cargo terminals would be built, old ones would be refurbished and new security technology would be installed.