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Then they aren't even receiving interest on their monies invested.
Too, since your only receiving $2k per month you can't possibly buy them out of the business and live at the same time.
Given just those circumstances - I think you have to come up with a new agreement with them as to ownership interests in the business and the amount of time each has to work there. Given that your only making $2k per month, I would think that you might want to move on yourself and look for other employment.
Can you sell the equipment/inventory and recover you expenses?
That could be done - that because your the only one working you would make a larger percentage or the first amount of monies when so much was paid.
No, I don't have any examples of something in your situation. Yours is quite unique in that 3 persons put in money and only one is working - and they aren't getting anything at this time for their monies.
It's usually how creative can you be and what can you all agree on. Yes, your the only one working but they have monies invested and getting no return on their investment.