I'm not following your logic. You're trying to say that the existence of regulation somehow prevents the spread of information via word of mouth? Besides, in

I'm not following your logic. You're trying to say that the existence of regulation somehow prevents the spread of information via word of mouth? Besides, in Bangkok with its 8 million people, does the word of mouth even make any difference? You don't have to rely on return customers in the city with millions of people.