But it cannot surpass the total value of an economy, and if you started with a tiny fraction of all capital at the start, your portion of final capital will lik

But it cannot surpass the total value of an economy, and if you started with a tiny fraction of all capital at the start, your portion of final capital will likely be around that same small portion of all capital. Thus the premise stands. Compound interest is not a parasite eating value from other items. It is only a return on investment, which everyone is competing for.