CNBC guests vote for the optimal top rate of income tax.

Maria Bartiromo gets the buzz from Zhang Xin, CEO of SOHO China, on Davos and what's happening in China.

Harvard University Professor Lawrence (Larry) Summers says the U.S. should take advantage of "negligible" long term interest rates to improve healthcare and education.

George Osborne, Britain's finance minister, tells CNBC's Maria Bartiromo why the U.K. must stick to its deficit plan.

Michael Corbat, CEO of Citi and Antony Jenkins, CEO of Barclays spoke to CNBC about their outlook for the bankin industry.

Davide Serra, founding and managing director at Algebris Investments, tells CNBC that banks must cut compensation in order to build capital.

Guy Ryder, director-general of the International Labour Organization, tells CNBC that the impact of long-term unemployment in countries like Spain is catastrophic and that in 2013 the picture looks worse.

Hesham Mohamed Qandil, the prime minister of Egypt, tells CNBC that Egypt has a clear political path and they have started engaging in domestic economic reform.

Joaquín Almunia, EU Competition Commissioner, tells CNBC that UK companies will not be treated any differently despite David Cameron's 'risky' decision to commit to a referendum.

Fredrik Reinfeldt, Swedish Prime Minister, tells CNBC he believes UK Prime Minister, David Cameron was taking initiative by calling a referendum and fighting to stay inside the European Union.

Muhtar Kent, chairman and CEO of Coca-Cola, tells CNBC why spiraling youth unemployment is the most important issue for governments to address.

Fan Gang, former advisor to the People¿s Bank of China and Yale University economist, Robert Shiller, discuss the economic outlook for China and the United States.

Ian Cheshire, CEO at Kingfisher, tells CNBC why a lack of clarity in policy-making all over Europe is the underlying cause of economic uncertainty.

John Chambers chairman and CEO of Cisco, tells CNBC that Apple's stock is evidence of how quickly things can change in the tech industry and you have to keep adjusting or get left behind.

Anthony Jenkins, CEO of Barclays, speaks to CNBC about job cuts, broad changes in the financial services sector and imposing a new code of conduct on the bank.

Enda Kenny, Ireland's Prime Minister, tells CNBC that Ireland did not get the same deal as Greece when it applied for a bailout and the mechanisms that are now available should be applied to Ireland.

Herman Gref, CEO of Sberbank, talks to CNBC about the outlook for the Russian banking sector which he expects to grow between fifteen and twenty percent this year.

Carlos Ghosn, CEO of Renault-Nissan, tells CNBC that France has a fundamental problem of competitiveness and defends the company's job cuts in the country.

Michael Corbat, Citi's CEO tells CNBC that Europe remains challenging but the bank sees opportunities in emerging markets.

Fabrice Brégier, CEO of Airbus, tells CNBC that everyone should know that air transportation is the safest in the world and that Boeing's grounded 787 planes were not a danger to passengers.