Is that correct?
Yes, it is.
You need to tell them why they have no choice but to give you a job at 15% more than the highest amount they wanted to pay. You are better qualified for the possition than anyone else......
Thank you guys! So, it's ok if I write my 'motivation letter' in the American Cover Letter format?
Yes, it is ok. Nobody is going to read it anyways.
What's the 'American Cover Letter format'? I've written cover letters before (looong time ago), but I'm a Brit so I'm not sure they really compare
Have you ever compared a US resume to a French CV? They can be quite different. Without knowing what exactly the ACL format entails, I would say that is quite different to a 'lettre de motivation' based on the difference between a resume and CV.
Anyway, I go with what swis says: "Yes, it is ok. Nobody is going to read it anyways."
Good luck.