And this other speech seems relevant too:
Now the other thing we’ll have to do is this: Always anchor our external direct action with the power of economic withdrawal. Now, we are poor people. Individually, we are poor when you compare us with white society in America. We are poor. Never stop and forget that collectively — that means all of us together — collectively we are richer than all the nations in the world, with the exception of nine. Did you ever think about that? After you leave the United States, Soviet Russia, Great Britain, West Germany, France, and I could name the others, the American Negro collectively is richer than most nations of the world. We have an annual income of more than thirty billion dollars a year, which is more than all of the exports of the United States, and more than the national budget of Canada. Did you know that? That’s power right there, if we know how to pool it.
We don’t have to argue with anybody. We don’t have to curse and go around acting bad with our words. We don’t need any bricks and bottles. We don’t need any Molotov cocktails. We just need to go around to these stores, and to these massive industries in our country, and say, “God sent us by here, to say to you that you’re not treating his children right. And we’ve come by here to ask you to make the first item on your agenda fair treatment, where God’s children are concerned. Now, if you are not prepared to do that, we do have an agenda that we must follow. And our agenda calls for withdrawing economic support from you.”
And so, as a result of this, we are asking you tonight, to go out and tell your neighbors not to buy Coca-Cola in Memphis. Go by and tell them not to buy Sealtest milk. Tell them not to buy — what is the other bread? — Wonder Bread. And what is the other bread company, Jesse? Tell them not to buy Hart’s bread. As Jesse Jackson has said, up to now, only the garbage men have been feeling pain; now we must kind of redistribute the pain. We are choosing these companies because they haven’t been fair in their hiring policies; and we are choosing them because they can begin the process of saying they are going to support the needs and the rights of these men who are on strike. And then they can move on town — downtown and tell Mayor Loeb to do what is right.
MLK was telling people to use their money as a weapon against the corporations with racist hiring practices. Of course, it is every American’s right to buy (or not buy) a brand of milk or bread or soda as they please.
He was using what is right with America to fix what was wrong with America.
I think we should remember this part of MLK as much as the lines about his dream and the lines about the promised land.