Guild Wars isn't real life, but some principles of real life apply. I'm not going to discuss anything that relies on scamming or decieving, I will only focus on concepts that provide mutual benefit between players.
The one important principle is that you cannot possible get rich off of your own labor. You have to figure out how you can get hundreds or thousands of other people's labor to make you money.
1) Basic example: a manufacturing company. The workers dont have a way to make much money, but the company pays them. This allows them to make more than they could on their own -- which, in the absence of other jobs, would be zero.
Can this concept be taken into GW?
You have to meet one requirement: the amount that they benefit from being in the company must be greater than their benefit of not being in the company. Unless your company/Guild has something extremely super special to offer, this must come in the form of money (for the members) if you want to make a profit. Therefore, if you want to make a company in GW, you must be able to pay the members more than they are capable of farming on their own.
In order to meet this requirement, it is necessary that the product of the workers' labor is valued at more than the value that they could get for their labor individually. There are 2 basic ways to achieve this:
1) Be a middleman. If someone spends all their time farming, they cant spend as much time learning the accurate market values, or making trade connections -- and vice versa. If you are excellent at farming, and you can find someone who is excellent at selling, then you can sell your items to the person who's good at selling for a price that is beneficial to the farmer, and the seller can sell them to the right people to make more money for himself. Win win situation. But, this is small scale. The bigger scale this operation gets, the lower the profit margins can be made, and the more business you can pull in, the more people you can hire, and the closer you get to becoming a Wal Mart.
2) The other way is if the labor does not have any value without being part of a joint effort. For example, if one person knows only knows how to program the chip, and the other person knows how to design it, and the last how to build it,they can combine their efforts and make something that can be sold for profit. There is only one example analogous to this in GW where teamwork can produce something that individual work cannot: the hall of heroes. So, this could potentially be made into a business based around this principle. There are a few ways.
a) The team could be paid a percentage of the winnings. This would be necessary for the startup. You would probably have to start with an even-cut. fortunately your company cant go bankrupt since people might be willing to stay even if they only win once in a blue moon. However, you cant possible make a ton of money doing this, because your team wont be winning all the time.
b) another way would be to pay them not for winning, but for showing up and fighting at the designated times, with bonuses for winning but with most of the profit going to you. this would allow you to make more money If and only if you were able to design teams very well, such that you had a good chance of winning.
c) To REALLY make money from this, you would need to train other people how to make good team builds. These people would run their own teams, paying their members, or even taking them on for free with the promise of a cut of the earnings if they won. All you have to do is find good team leaders to go around gathering the proper players for the builds you design. These leaders would then pay you for showing them how to design the builds in an ever changing metagame. Then you could pull in very big bucks.
However, in order to make the jump from owning a single team to owning many teams, requires that the metagame be constantly changing. If it doesnt change, or changes too slowly, your team leaders will have no need of the expert build designer. Alternatively, if thye think that it is simply an easy thing to adapt to the metagame quickly, or you arent doing a good job, you will lose those leaders...and they may even start to send teams in that oppose your teams.
Anyway, I'm not a GW billionaire, but these are the ways that I see that economics could be used to get rich in GW.
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