If you don't have large corporations you don't have large economies of scale. Things like banks, insurance companies, shipping companies, airlines, mining companies, supermarkets, shopping malls. I like to use large chain supermarkets because they have a larger range and bigger aisles. I don't have to trot off to the butcher and the fruiterer and the baker. I like very large shopping malls because they are convenient. I like buying cars from large m!@#$%^&*-producers because they are cheaper and have a larger service network. Sure there are serious problems that need to be managed with respect to large companies (#1 I think is rampant consumerism), but it is kinda necessary if we want a high standard of living in a capitalist system. Unless you can think of a better idea? Fwiw, there are things about theoretical communism that appeal to me. The fact that it is not based on class, but based on ability and need. But by the same token, I'm glad I live in a capitalist society. I just wish it was better regulated.