The hardliners, who believe in the strict implementation of laws from 40 years ago, continuously clash with the reformists, who are pushing for more economic transparency.
Prices of food, especially meat, have risen a lot since U.S. President Donald Trump withdrew the United States from the 2015 nuclear agreement with Iran.
Earlier at the anniversary celebrations, Iran's president Hassan Rouhani told crowds on Monday that Iran was committed to a path that will see the country expand its "military power".
Ayatollah Ali Khamenei is set to publish "a detailed statement explaining the "second step" of the progress of the Islamic revolution", his official website said.
He vowed to boost Iran's military and ballistic missile program.
"After 40 years, the Islamic Republic of Iran has failed to fulfill its promises to uphold and safeguard the rights of its citizens", Bolton tweeted Monday morning. The regime in Iran has produced only #40YearsofFailure.
He also blasted a USA "conspiracy" against the country, saying, "The presence of people today on the streets all over Islamic Iran. means that the enemy will never reach its evil objectives".
An Iranian man marches with a portrait of the country's Supreme Leader Ali Khamenei (L) alongside a woman holding up another of Islamic Revolution founder Ayatollah Ruhollah Khomeini (R) during a ceremony celebrating the 40th anniversary of Islamic Revolution in the capital Tehran on February 11, 2019.
"US should take note: REAL Iranians never succumb to diktats".
"The presence of people in this celebration means that plots by the enemies. have been defused", Rouhani said.
"Iran has changed from a backward nation to a world power", said the 50-year-old.
In January, President Hassan Rouhani said Iran was facing its worst economic crisis since the Shah was toppled.
The Shah was the United States' closest ally in the Middle East. "But if they attack us, we will raze Tel Aviv and Haifa to the ground", Javani was quoted as saying by state news agency IRNA, according to Reuters.
An anchor on state television warned of hostile foreign media trying to downsize the participation of Iranians in the march but expressed confidence that "they would be confounded by the unprecedented level of attendance".
"If this regime makes the mistake of threatening us and tries to destroy Tel Aviv or Haifa, they won't succeed, and it will be the last anniversary of the revolution that they celebrate".
"I don't ignore the threats from the Iranian regime, but I'm also not intimidated by them", Netanyahu said in a Hebrew-language video.
Former public servant Saaghi insisted that it remained paramount for Iranians to stick by the revolution.
Iran also has vast clout in Iraq, where Major-General Qassem Soleimani, head of the overseas arm of the Revolutionary Guards, was frequently photographed guiding Shi'ite militias in the war against Sunni Islamic State militants.
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