There are a couple of concepts that need to be clarified.
Are we talking about “gold standard” money, or are we talking about using gold bullion coins as money?
Because all a gold standard means is that the authorities will give you fresh printed paper money at such-and-such a rate for your gold bullion, and will sell you gold bullion at such and such a rate for your paper money.
What this means is that your paper money has a fixed relationship to the value of gold. But the real economy operates on paper money. The paper money represents a certain weight of gold, because it can be exchanged for that weight of gold at the government bank. But all the other panoply of modern financial instruments are available–we can lend money, we can have credit cards, we can have fractional reserve banking, we can extend credit, and so on.
Of course the problem with this is that in real life the government will make it extraordinarily difficult to exchange paper money for gold, and the instant there is a war or depression or crisis they will suspend gold payments. Or make it illegal to own gold. Oh, the gold is there, but citizens can’t own gold, that’s crazy talk. Since the government has to control the gold supply to control the money supply, get used to extremely tight control over gold.
But of course, what many gold bugs really object to is the banking aspect. They don’t want gold standard currency, they want gold bullion. But that makes modern financial life impossible. Let’s say I own a store. Can I extend credit to my customers? Like, we all use gold bullion, but Grandma Smith comes into my store and tells me she will gladly pay me a gram of gold Tuesday for a loaf of bread today. And I say sure, and I hand her the loaf of bread, and write down in my ledger book that Granny Smith owes me a gram of gold. Except, great, I’m now a bank. I’ve loaned her a gram of gold, which she used to buy my goods, and I’ve got nothing to show for it except a scrap of paper.
If the problem is that a scrap of paper cannot be money, then our whole economic system cannot work, because the vast majority of economic transactions today exist only as scraps of paper, and not even that but rather ledger entries in computer databases. A dollar bill is a scrap of paper exactly the same as a notebook entry saying that Grandma owes me a dollar. And a scrap of paper that says the government owes me a gram of gold is exactly the same as a scrap of paper that says that Grandma owes me a gram of gold, the only difference is how much I trust that the government will pay me back vs whether Grandma will pay me back.
Is the problem that your bank should represent your savings account in grams of gold rather than dollars or euros? Who cares? Look, you can take your paper money, or your credit card, and go to any coin shop in your town, and buy gold right now. If you don’t trust the assholes in Washington to keep the money supply honest, you can get gold coins and take them home with you every time you cash your paycheck, the only problem is you have to take that additional step of visiting the gold dealer. Because gold is just another commodity in today’s economy, we have a free market in gold, and no bureaucrat in Washington is going to get the vapors because free citizens own gold. You can buy and sell things for gold if you want, the only problem is finding people willing to accept your gold rather than paper money. So maybe it’s worthwhile to keep your savings as gold, but have a bit of paper/electronic money around for your day-to-day transactions.
You are perfectly free to do this, and any billionaires who are worried about the money supply are also free to stock up on gold bars rather than worthless fiat money. But billionaires aren’t billionaires because they have bank accounts worth a billion dollars. Instead they own companies and productive assets that are worth a billion dollars. Mark Zuckerberg owns Facebook stock, not a swimming pool filled with gold coins or dollar bills. And when the economic crunch hits, the only thing that makes him the “owner” of “Facebook” “stock” is a legal system that says he does.
If you want to save gold coins under the mattress because you don’t trust banks and governments, go right ahead. If the problem is that governments and bankers are all corrupt bastards who swindle the common man, well, that’s true, but switching to a gold standard paper currency won’t solve that.