In the past ten years, the popular american holiday, halloween, was "imported" to france by retailers hoping to increase revenues. essentially, the french learned the traditions such as trick-or-treating and wearing costumes from americans. this is an example of on an international scale. normative social influence the autokinetic effect informational social influence injunctive norms

From the example given, it can be said that a type of social influence called informational social influence is happening to the French people.  

Informational social influence is a type of social influence where the individual conforms to a certain set of behaviors and norms because he or she believes that someone else is more knowledgeable about that situation.

In the case of Halloween, since it is an American holiday, the French are imitating traditions that the Americans do during the celebration since the French are unfamiliar with the customs that people do during Halloween.