I suppose a grand plan might be necessary to begin the incremental development. For instance, someone might announce that they would be an Effective Altruist Producer. They would commit to transparently limiting their personal financial gain from their business to X amount. Then, the EA community would consciously direct whatever business they had in that area through that Effective Producer. The secret sauce here would be that communication would enable Effective Altruists to consciously direct the profits of their consumption.
So, I guess a proof of concept might be a Life Insurance Salesman Effective Salesman in New York. We would have one Effective Altruist transparently contractually commit to devoting the proceeds of his sales to Effective Charities. Then, say that there are 10,000 Effective Altruists in New York who want to buy Life Insurance (just as part of their normal economic activity) which would end up yielding $1.5 million in commission for this Effective Altruist Agent, all but $50k will go directly toward Effective Charities. So, basically, counterfactual, $1.5 million that year of profit would be generated and probably not have gone to Effective Charities.
Once such a proof of concept was done, we as an Effective Altruist community could recruit people in many spheres of economic life to be Altruistic Producers and then, through networking resources, direct as much as possible of our purchasing goods and services through Altruist Producers...
Sure… It could start with just one person who made the commitment and then a network of people who channel their buying of whatever he or she sells through that person.