The financial crisis led to the worst depression since 1929. Only by massive economic programs could worse be prevented. Here Keynesian theory came into play. Only through globally agreed massive credit-financed government spending increases could depression be prevented. The banks had to be saved with tax money, as many banks had invested in the government bonds of weak European countries whose solvency was called into question. The sovereign debt crisis has emerged from the financial crisis. Against this background, the question arises of state regulations that limit the risk of banks. Such regulation of the financial markets has been urged by politicians and economists since the onset of the 2007 financial crisis. What has happened in the meantime? Were the right reforms implemented or could there be another financial crisis? After analyzing the causes of the crisis, the main reforms are examined below.