The meeting's great success is $1.1 trillion in economic aid for the developing world, but other proposed solutions to the recession were vague.
While French and British leaders have been high profile, the low-key German chancellor is getting credit for the summit's regulatory focus.
The Obama-Hu exchange seemed to go well, while dinner Wednesday night gave Obama and Germany's Merkel a chance to reach greater détente.
The global crisis has led to political upheaval in many countries, unseating three prime ministers in Europe alone.
Merkel, in visit to headquarters of GM's Opel unit, says that direct aid is unlikely.
Ahead of G-20, German leader balks at more spending and more debt.