President Biden on Monday ordered a National Day of Mourning and directed flags to fly at half-staff following the death of former President Jimmy Carter, calling the former Georgia governor and Nobel laureate “a man of deep decency whose life after the White House redefined public service.” The White House said arrangements will include a state funeral and a period for lying in state at the U.S. Capitol; further details will be released by the president’s staff in the coming days.

Carter, whose post-presidential work with the Carter Center and Habitat for Humanity earned him global respect, prompted a cascade of tributes from political leaders and foreign governments. In a statement, European officials hailed his mediation on global health and human rights; the secretary-general of the United Nations praised his “quiet diplomacy” on issues from election monitoring to disease eradication. Former presidents and lawmakers from both parties expressed condolences and recalled Carter’s role in brokering the 1978 Camp David Accords and establishing the Department of Energy amid an oil shock-era focus on conservation.

The announcement briefly altered the tone in Washington, where ceremonial preparations and a steady flow of statements displaced the partisan sparring that has dominated the capital. “He believed that small acts matter and that public service could be sustained by decency,” Mr. Biden said in his written tribute. Republican leaders, while noting policy disagreements from his presidency, emphasized Carter’s humanitarian work and his commitment to democratic norms.

Markets responded calmly but discernibly. U.S. equity futures slipped roughly 0.4% in early trading as investors booked modest profits and sought safer assets. The benchmark 10-year Treasury yield fell about 8 basis points to near 4.10 percent, and the dollar index retreated by roughly 0.3 percent, according to midday trading averages. Analysts said the moves reflected short-term risk-off positioning rather than a reappraisal of longer-term economic fundamentals, with major macroeconomic releases and central bank signals still expected to drive markets this week.

Economists and historians noted that Carter’s practical policy legacies — from energy conservation initiatives and deregulation measures to a renewed emphasis on human rights in foreign policy — have shaped debates still relevant to today’s economic challenges. His administration grappled with double-digit inflation and the energy crises of the late 1970s, experiences that economists say informed later policy frameworks on central banking independence and strategic petroleum reserves.

While the National Day of Mourning is largely ceremonial, it underscores a rare national pause that briefly realigns public attention from legislative battles and market volatility to a collective reckoning with public service and civic life. Officials said federal operations will continue, and markets are expected to stabilize as traders digest scheduled economic data and central bank pronouncements later in the week. For many Americans, the days of remembrance will be a prompt to revisit Carter’s long second act — a post-presidential career that, by most accounts, became as influential as his four years in the White House.