question on pricing
 

Since I am new,can anybody throw light on pricing for Buisness class tickets and the rationale for it costing more than 3 times ECONOMY[non-discounted]?I think more US orginating passengers paying their way may fly to India buisness class VFR if prices were limited to twice economy.

You can get discounted business class - and sometimes that price is cheaper than full flex economy, or rather less than 2x economy. Depends on how much of a demand there is .. demand, supply etc. How much light do you need?

Business is normally priced around 3x times economy prices. This is their icing on the cake where they make their profits.

You could consider Premium Economy on BA or VS. That is normally slightly more then economy and you get better seats, leg room, luggage allowance.

One should compare discounted biz fare with discounted economy fares with similar restrictions. Sometimes discounted biz fare can be less than or just slightly more than full Y.

That's because seat density for a given cabin is about two and half to three times for the economy class than for the business class. It's easy to calculate.
For uniform cross section ans uniform spacing, not counting galley size and the lav space,
Number of seats=((length of the cabin/seat pitch)+1)*number of seats abreast.

with my usual carrier British airways on the lhr-bom route

the fares (all discounted) usually break down like this :

Y = £350
Y+ = £650
J = £1600
F = £3500

y to j = 5 x difference
y to f = 10 x difference
j to f = 2x diffrence

Obviously, you are using Y, J and F loosely and not as a specific fare bases. You are also confusing cabin designations with fare bases. One can't compare an economy class fare with business class or first class haphazardly. J is full fare business and Y is full fare economy. What you are calling J is not J, as J is a full fare. There is a world traveller plus, but no Y+ on BA.
Looks like you have taken the lowest coach fare and comparing it to any odd fare in other cabins. Cheapest coach fares (cheapest World Traveller) earn only 25% miles and no tier points while all World Traveller Plus fares earn 125% miles and tier points. You need to compare fares with similar restrictions

no i think you are the one who is confused:

Y means Economy
Y+ means Economy +
J means business class
F means First Class

I have mentioned that all the prices quoted are the cheapest available in those cabins.

If you want to get into Fare basis then the cheapest are usually:

M (representing the Economy cabin) is £350
T (for WT+) is £650
I (for J) is £1600
A (for F) is £3500

ROFL. I am tryi9ng to tell you something but you are unwilling to shed your ignorance. I am going to try one more time. Y is loosely used to mean economy cabin, known as World Traveller in BA and Y+ maybe loosely used to denote World Travller Plus. . Y is also a fare bucket and is full fare. There is no Y+ class. Economy class has many fare buckets while econmoy plus , business and first have fewer buckets.
M and T class LHR-BOM in March/April are nearly equal (It doesn't make sense). The business class fare you quoted is I , not J. J fare, which is full fare, is much higher. Similarly A and F are not the same thing.
I get M fare of about £615. For some reason T fare seems to be unsualy low. Even V and K are more than T. It might be a mistake. £350 for BOM is very good fare, but it's not in M class. It must be O, the cheapest and heavily discounted economy class, the class used for promotions and consolidation.

I know what Fare codes are and what J, F, Y mean. I was a reservations agent at AA. I was just trying to illustrate the differences in pricing for each cabin using the abbrievated letters representing the cabins. Nothing to do with Fare codes.

My bad regarding M class, your right O class is the cheapest available. I got confused thinking about another airline.

I used Y, Y+, J and F so that so people understand the cabins the fares represent. Airlines, depending on their branding, call the cabins differently.

BA uses World Traveller while Virgin call it economy.
BA uses Club while Virgin call it Upper Class.

I was just trying to use the codes that make sense to everyone. Apart from real nerds, most people assume Y means Economy, Y+ means Economy+, J means Business class, F means First Class. I think you made a mountain out of molehill here!