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Therefore, he should invest five, ten, or 15% of that $100 in Bitcoin and keep the rest invested in local currency or gold as an emergency fund so that he can use it when needed.
Investing like 5-15% of the $100 in Bitcoin and the remaining percentage ( probably 75-95% in gold or local currency)may sound smart but it may not really be the best idea especially for people in countries with high inflation rate, where the value of their local currency keeps dropping on a daily basis. And the implication of this is that the money you have today might buy you lesser and lesser things as day keeps rolling by.
Gold may seem stable but it doesn't grow as fast as Bitcoin does overtime.
If you understand Bitcoin well you will notice that it is better to push up your Bitcoin allocation to maybe 30-40% due to its high appreciation rate.
You are correct about this point, countries which inflation is eaten up there local currency having a large possessions of fiat in there local currency wouldn't be a nice idea since the value of the fiat will reduce drastically with the passage of time.Gold can be used to store value, however it can't be compared to bitcoin in terms of growth.increasing bitcoin allocation to 30-40% will definitely make sense morespecially for long term investors and can act as hedge against volatility.it wont be a nice idea to use gold as an emergency funds since gold is not liquid rather fiat should be used for emergency funds because of how liquid it is.