Article R2352-2 of the French Public procurement code
The purchaser shall require the tenderer to explain the price or costs proposed in his tender if it appears to be abnormally low in relation to the works, supplies or services.Justifications may be taken into consideration relating in particular to the following aspects:1° The method of manufacture of the products, the arrangements for the provision of the services, the construction process;2° The technical solutions adopted or the exceptionally favourable conditions…