The public response from the German Government was muted, with Merkel's spokesman describing the French denigration as "background music".
However, the memos - which were leaked to the financial newspaper Handelsblatt - reveal Berlin's harshly critical private view of France's economic woes.
The German Economics Ministry's briefing points out that France has the "second lowest annual working time" in the European Union, while its "tax and social security burden" is the highest in the eurozone. It also warns that France has made too little investment in research and development.
The briefing by the Free Democrats is likely to cause fresh tension between the European partners by describing Hollande's reform programme as "meandering".
The divide between the two nations traditionally regarded as the driving force behind European integration was underlined with new figures showing French unemployment, at 11 per cent, was double that in Germany. The German jobless rate of 5.4 per cent is the second lowest in Europe.
While France clings to its 35-hour working week, workers in Germany have endured years of low pay rises.
The Organisation for Economic Cooperation and Development has said it expects the French economy to grow by 0.1 per cent this year, and has criticised "excessive regulation and high levels of taxation". The German economy is forecast to grow by 0.5 per cent.
The French criticisms of Merkel were made in a working paper prepared before the Socialist Party's convention on Europe in June, which was leaked in the French press last week. The paper's authors claimed that the Chancellor "thinks about nothing except the savings of account holders on the other side of the Rhine, Berlin's trade balance and her electoral future".
German politicians have defended Merkel. Andreas Schockenhoff, foreign affairs spokesman for the Christian Democrat party, said: "The attacks by senior French socialists on the Chancellor are unusual for the German-French relationship, and they are inappropriate. The left-wing Government cannot divert attention from the fact that France requires deep structural reforms."