"Great, more people, more money", the crown prince told reporters.
An adviser to Turkey's president on Monday rejected Riyadh's assertion that Jamal Khashoggi died in a fight, suggesting it "mocked" world opinion, as Western incredulity deepened over varying Saudi accounts of the journalist's killing.
United Arab Emirates Prime Minister Sheikh Mohammad bin Rashed, right, and Ibrahim al-Assaf, Saudi State Minister, attend the opening of the Future Investment Initiative conference, in Riyadh, Saudi Arabia, on October 23, 2018.
Other senior German politicians, including foreign minister Heiko Maas and foreign affairs committee chairman Norbert Röttgen, have also called for a halt in arms sales to Saudi Arabia, citing dissatisfaction with Riyadh's explanation of how Khashoggi died inside the Saudi consulate in Istanbul.
Meanwhile, Dmitriev, the head of Russia's Direct Investment Fund, said Khashoggi's killing needed to be investigated and the culprits punished, but that the Saudi drive for economic and social reform could not be ignored.
The address, which could have significant impact on relations in the middle east, came a day after United States president Donald Trump said he was still not satisfied with the Saudi explanation for the killing, but said he did not want to lose investment from Riyadh.
At the opening of the conference, Saudi Energy Minister Khalid al-Falih described the journalist's killing as "abhorrent".
Interested in Jamal Khashoggi?
A clutch of countries, including Germany, Britain, France and Turkey, have pressed Riyadh to provide all the facts, and Chancellor Angela Merkel said Berlin would not export arms to Saudi Arabia while uncertainty over Khashoggi's fate persisted.
"Nobody in the kingdom can justify it or explain it. That is something that the global community can not stand for and we're being very clear about that".
Saudi Aramco said it signed 15 memoranda of understanding worth $34 billion.
In that address, the president said the remains hadn't been found, and asked: "Why has the body of someone who was officially said to be killed not been found yet?" He also announced plans to build a $US500 billion futuristic city in the desert.
Mr Johnson wrote in his Daily Telegraph column that "we can not just let it pass", and, while the United Kingdom has crucial trade and security links with the Gulf State, "the United Kingdom and the USA must lead other countries in holding Saudi Arabia properly to account".
Schwarzman is among those who've backed out of attending this year.
Among its many investments domestically and overseas, Saudi Arabia's sovereign wealth fund, which the Crown Prince oversees, has invested $US20 billion in a US-focused infrastructure fund with Blackstone.
Canada has added its voice to global calls for answers, with Trudeau saying on Tuesday that the Saudi government's explanation of what happened lacks credibility.
Khashoggi, a Washington Post columnist and critic of the Saudi government, disappeared after he entered the Saudi consulate in Istanbul on October 2 to obtain documents for his marriage.