JERUSALEM – Within days of Donald Trump’s election to the presidency, Jerusalem’s city planning chief declared an end to the era of holding up new housing for Jewish residents in contentious neighborhoods out of deference to American objections.

Last week, he followed through, advancing a long-delayed plan to build 500 homes, a down payment on thousands more to come. The mayor’s office insisted that the timing was coincidental and the decision not political. But the planning chief made clear that he saw a green light to proceed “now that Trump” had won.

Call it the Trump Effect. Around the world, his election is already shaping events — or at least perceived to be shaping them — even though he will not take office for seven more weeks. Companies hoping to profit from Trump’s economic policies have seen shares soar. Countries fearing his anti-trade stance have seen the value of their currencies plunge against the dollar. Governments are recalibrating policies on trade, defense and immigration.

The behavior of the global markets toward Trump has been uneven. On Monday, stocks and the dollar slipped slightly and bond prices rose, perhaps indicating a bit of caution after the postelection stock market surge.

Much of the markets’ mixed reaction reflects uncertainty about a new president who has never held public office, leaving political leaders, business executives and international institutions to make bets on how a Trump administration may rewrite rules that have governed global affairs under American presidents of both parties.

“For allies and adversaries alike, the election of Donald Trump represents the likely abandonment of a decades-old U.S. commitment to uphold the global order,” said Ivo Daalder, a former U.S. ambassador to NATO who is now president of the Chicago Council on Global Affairs.

For some, there was initially a promising forecast. U.S. and foreign stock markets climbed in what some analysts called “the Trump bump.” The Dow Jones industrial average has broken several records since the election, and last week topped 19,000 for the first time amid expectations of more business-friendly regulatory policies. Investment banks like Goldman Sachs have fared particularly well.

European firms have seen stock prices rise, too. Deutsche Bank, whose shares shot up as much high as 17 percent after the election, has reasons for optimism beyond its longtime ties to Trump’s businesses. With the Justice Department proposing a $14 billion fine as it begins negotiations with the bank over its handling of mortgage-backed securities in the 2008 financial crisis, some in Germany hope a new administration will ease up and loosen regulations.

Another company that has seen its share value increase since the election is Magal Security Systems, an Israeli firm that helped develop high-tech security barriers around Gaza and the West Bank. With Trump’s promise to build a wall along the border with Mexico, investors expect that firms like Magal could get some of the business. Magal’s shares rose as high as 24 percent above their pre-election level, with trading volume as much as 150 times higher.

For the same reason, Mexico has taken an economic hit since the election. Besides the wall, Trump has vowed to withdraw from the North American Free Trade Agreement. Mexico’s peso has fallen sharply and its central bank last week slashed its growth projection for next year, citing “the electoral process in the United States.”

Other economies have reacted with trepidation amid fears that Trump’s policies may drive up interest rates and inflation, an expectation that some traders call Trumpflation.

Some countries are trying to figure out how to respond in other ways. Leaders of NATO allies are looking at increasing military spending in response to Trump’s insistence that they pay a greater share of their defense. Lithuania last week chose a new prime minister who renewed the nation’s promise to raise security spending.

In the Philippines, where President Rodrigo Duterte has feuded with President Barack Obama, the government has tried to gain favor in Trump’s Washington. Duterte named as his new trade envoy to the United States Jose E.B. Antonio, a real estate tycoon who is helping build Trump Tower Manila. After Britain rebuffed Trump’s suggestion to name Nigel Farage, a leader of the Brexit campaign to leave the European Union, as ambassador to the United States, the Times of London reported that Farage may move to America anyway.

Nowhere has the Trump Effect been more visible than in Jerusalem, where the political right has openly rejoiced at the election. Prime Minister Benjamin Netanyahu, who has had a prickly relationship with Obama, has made clear to associates that he is overjoyed at Trump’s ascension.

Members of Netanyahu’s coalition expect Trump to abandon the practice of Obama and presidents of both parties who tried to restrain Israel from building housing in the West Bank and East Jerusalem. Shortly after the election, a Trump adviser said settlements were not an obstacle to peace, appearing to have adopted the argument Netanyahu makes.

“The next few weeks present a unique window of opportunity for Israel,” Naftali Bennett, who leads a pro-settler party in Netanyahu’s Cabinet, told a conference sponsored by The Jerusalem Post last week. After years of American pressure, he added, “It’s ours to decide.”

Betty Herschman, the director of international relations for Ir Amim, a group that opposes settlement construction, said it was too early to know what Trump’s policy would actually be. But she said one thing was clear: “The Israeli right is already celebrating.”