CEO Secrets: BlaBlaCar boss on making markets
19 November 2015 Last updated at 01:05 GMT
Nicolas Brusson, co-founder of BlaBlaCar, offers the business advice he wishes he'd had when he started out, as part of the BBC News series, CEO Secrets.
BlaBlaCar is one of France's most successful internet companies. It allows users to pay to take up unused seats on private car journeys, part of the sharing economy.
BBC News caught up with him at the Web Summit in Dublin.
You can read more about the #CEOSecrets technology special.