If there is no scarcity in the world, everything will be unlimited. This is unlikely to happen due to conservation laws. Everything comes from something. So, when we continue to consume something, eventually, it will run out if no supply is given. However, if there is no scarcity in the world, there will be no greed and war between nations. People would also tend to be complacent. Humans have continued to make developments due to need. But if everything is in abundance, it may influence the people to be comfortable which will dampen development.