Air fare: business cl is cheaper than economy?? doesn't make sense!?

I work for an Airline in the UK but I'm sure things work the same with all of them - there is no catch involved: if most of the seats in economy are already booked but not many advance bookings have been made in Business Cl it makes more sense to sell the Business Cl tickets at a reasonable price than just sell all economy tickets and then have to upgrade people for free on the day when economy is overbooked. Many people will just automatically book a ticket in economy without considering looking at business cl fares. Also, if you have a fantastic flight in Business and love the experience they always hope it will make you consider always flying that way in the future even if the price is a little higher! My advice - don't worry about a catch, book that nice seat, have a fantastic holiday and enjoy a pampered flight.