A letter from ... Caroline Kuhnert is responsible for high net worth individuals at UBS. Sie explains why wealth can have a positive effect far beyond the economy. We've just published our fifth Billionaires Report. Our aim is to contribute to a better understanding of this exclusive group of people. How has their wealth changed? Aber above all: What is the influence of the high-net-worth individuals on our society? And are there regional differences?

A letter from ... Professor Marcel Fratzscher. The head of the DIW sees the current justice debate as misguided and calls for an inclusive social market economy. "Time for Justice" was the motto of Martin Schulz's election campaign. In a country where 70 per cent of people feel that inequality is too high, this slogan may catch fire. I still think: Wir need a debate that goes beyond justice.

A letter from ... Dr. Walther Michl. The Academic Council at the Chair of Public Law and European Law at LMU München has placed the refugee crisis within the current legal framework. In the public discussion on the refugee problem, the call for a "return to the law" is repeatedly voiced - often combined with the demand for the closure of borders.

A letter from ... Bernd Kolb, who founded the Club of Marrakesh to give impulses for a better world. Because the effect was not strong enough for him, he is now breaking new ground. Our western world is a wonderful place that makes many things possible: a life in peace and prosperity, without existential worries, with a rich culture and sufficient space for the individual shaping of one's own life. Actually, everything's fine. Didn't I?

Jochen Felsenheimer is Managing Director of XAIA Investment and reflects on the long-term consequences of the policy change in Greece. Everywhere on the markets there is wild speculation about the effects the shift to the left in Greece might have on the European financial markets. And it's not that hard to judge. After all, the economic facts have been known for several years.

A letter from ... Wolfgang Bosbach. The controversial member of the Bundestag reflects on politics, Europe and the social performance of our country. After the election, I leave the Bundestag and am therefore often asked what the three points are that most concern me at this crossroads of my life;

A letter from... Christian Jasperneite; The chief strategist von M.M. Warburg & Co. warns that dubious budgetary policies in Europe are taking the Central Bank hostage.

A letter from ... Rudolf X. Ruter. The sustainability and corporate governance expert is convinced that credibility and reputation are the currency of our future. Despite the misconduct at Volkswagen, Deutsche Bank and DFB/Fifa (to name just three concrete names), which is currently much discussed in Germany, I am convinced that respectability is still widespread in the German economy. More and more and especially younger managers are committing themselves to a clear sense and value orientation…

Swiss biologist and environmentalist Claude Martin calls for a global strategy to reverse the fate of tropical rainforests. I don't remember ever meeting people who didn't care about the future of tropical rainforests. Whether scientists, entrepreneurs or politicians, everyone affirms how important this topic is.

A letter from ... Manfred Wittenstein, Chairman of the Supervisory Board of Wittenstein AG. He trusts that engineers will contribute to a better world. We're fine. We're fine. We here in Germany are fortunate to be born in a region that is not struck by natural disasters that threaten its very existence, where wars do not destroy entire villages and cities, where almost everyone has a roof over their heads and gets enough to eat. How do we deal with this gift of happiness? Shall we defend it…

Prof. Dr. h. c. mult. Reinhold Würth, the entrepreneur, art patron and chairman of the Supervisory Board of the Würth Group, is convinced that art increases motivation within the company. I've built up a global trading company for assembly materials and tools with 65,000 employees and a turnover of ten billion euros. Since our foundation by my father in 1945, we have recorded average annual growth rates of 22 percent. That makes me a little proud. But also humble. I could never have done it…