The world is heading to the Argentine capital Buenos Aires, where the summit of the Group of 20 (G20), which accounts for 90 percent of world output, will take place.

As leaders begin to arrive in Argentina, it is important to highlight the most important participants in the summit, the most important issues that concern them and are expected to dominate their activities.

Angela Merkel
Unlike the Hamburg summit last year, German Chancellor Angela Merkel will attend the Argentine summit at the end of her political life and has been greatly weakened on the international scene.

With unemployment falling to 5% in Germany, a significant trade surplus and a significant growth rate, Merkel is expected to defend free trade and renew her opposition to protectionist measures.

Mohammed bin Salman
Earlier, Saudi Crown Prince Prince Mohammed bin Salman arrived in Buenos Aires for the G20 summit, preceded by the murder of Saudi journalist Jamal Khashoggi at his consulate in Istanbul.

This issue has touched the reputation of the crown prince on the international scene. Human Rights Watch has asked Argentina to prosecute the Saudi Crown Prince in this case and the war on Yemen.

Riyadh, which is supposed to host the next summit, could take the opportunity to discuss the issue of low oil prices with other major oil producing countries.

Recep Tayyip Erdogan
The Turkish president is also carrying the Khashoggi case to the G20 summit, where Ankara insists on revealing the supreme body that ordered the killing of the man inside the Saudi consulate in Istanbul on October 2.

Erdogan is attending the summit after the economic crisis in his country, which resulted from the fall of the Turkish lira and disputes with the two states, reached its peak.

On the political front, Erdogan is stronger than he won the first round of early presidential elections held mid-year, and his party won parliamentary elections held on the same date.

Mauricio Macri
The Argentine president receives the leaders of the world's most powerful countries while his country faces a deep economic crisis with an annual inflation of 45% and a recessionary economy, which has weakened this center-right president.

In an atmosphere of crisis linked to multilateralism, the Argentine presidency hopes to reach points of understanding on the final statement, despite major international differences.

Michel Tamer
Brazilian President Michel Tamer is attending the summit of Argentina and his presidential term is nearing completion and enjoys no popularity.

All eyes are on his successor, Jair Paulsonaro, a rightist who is described as an extremist and hostile immigrant, and is due to take over on Jan. 1.

Shi Jingping
Chinese President Xi Jingping is a key figure at the summit and is scheduled to meet with US President Donald Trump while the escalating reprisals between Beijing and Washington continue to shake the world economy.

Shi argues that he advocates pluralism and opposes protectionism. But Americans and Europeans condemn the many obstacles faced by their companies based in this giant Asian communist country, as well as what they call "unfair measures such as the forced transfer of technology, if not the theft of intellectual property."

Donald Trump
Although the G-20 was founded to defend trade pluralism, US President Donald Trump is in Buenos Aires defending America's first motto and is determined to press his Chinese and Russian counterparts for his own files.

Earlier, the Trump administration said there was "a good chance" of reaching agreement with Beijing on certain terms. But it is hard to predict Trump's moves as he changes his position at the last minute.

Emmanuel Macaron
Amidst conflicting agendas at the summit, French President Emmanuel Macaron will seek to push forward the reform of the World Trade Organization and protect the Paris climate deal.

McCron is likely to meet Trump Fatra after he ridiculed his popularity in a tit-for-tat following the protests of the Yellow Jackets movement in Paris.

Theresa May
Theresa May is likely to be preoccupied with what is going on in London. The British prime minister faces difficulties days before a crucial vote on Dec. 11 in parliament over the "BRICEST" deal, which is threatened by deputies.

If it leaves the EU, London will rely largely on a free-trade agreement with the US ally.

Vladimir Putin
Vladimir Putin is one of the most important figures of the summit because he succeeded in ensuring economic stability in his country, and because Moscow is the center of major international files such as the conflict in Syria, the crisis in Ukraine, Western sanctions and tension between Russia and the United States.

But in the atmosphere of escalation between Moscow and Kiev, the expected meeting between Putin and his US counterpart could be canceled.

Attendance map
Of the 20 countries representing Asia, six are China, India, Indonesia, Japan, South Korea and Saudi Arabia.

The European continent includes four European Union countries - Britain, France, Italy and Germany - as well as Russia and Turkey, which are geographically bound by the continent.

Latin America is preparing for Brazil and Argentina, while the United States, Mexico and Canada are moving from North America.

Australia is the continent of Australia, at a time when Africa is the most modest representation in the money club, with South Africa alone making up a mass of more than 50 countries.