The economic system of the body of Christ is communism.
Scripture quotes come from the ESV.
Acts 2:44,45 states, "And all who belived were together and had all things in common. And they were selling their possessions and belongings and distributing the proceeds to all, as any had need."
Acts 4:32,34 states, "Now the full number of those who believed were of one heart and soul, and no one said that any of the things that belonged to him was his own, but they had everything in common. There was not a needy person among them, for as many as were owners of lands or houses sold them and brought the proceeds of what was sold and laid it at the apostles' feet, and it was distributed to each as as any had need."
And you probably thought, "From each according to his ability, to each according to his need," started with Karl Marx. I don't know if it started with the church, but it is documented here, long before Karl Marx. And you, as well as I were taught the Karl Marx was wrong. The only thing he was wrong about was who should administer the redistribution of wealth. He thought it should be the government. In the early church, it was the apostles. Eventually, deacons would do this.