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agree ..but it would be much more complicated to, just print money in surprise, like some african governments do now
in any case it would be an improvement

This is not complicated. Just change some code in coin code.

I am not such a big expert about how cryptocurrencies work and how complicated it to create inflation in those coins ..but if it is so easy as you say and the coin won't be decentralized and limited in number like the bitcoin - than all my enthusiasm is for nothing :(

I believe Ethereum is unlimited, but only in the sense that more tokens are created as people build applications on top of their platform. Its necessary in order for new applications to be delivered. They don't simply create new tokens out of thin air. Now if they were unscrupulous people then I guess it's always possible, but the entire blockchain would lose credibility and fall apart.