In the future, bands of sub-humans will roam the planet subsisting on whatever they can scrounge from the Earth. A Master Class of humans will live in castle-like structures surrounded by Iron walls. All forms of paper currency or securities will be worthless.
We are on the verge of a complete societal breakdown. After the Great Societal Implosion, gold may have some trading value, but I expect that things like food and water will be the most valuable items.
We are headed back to a feudal-type society. Trading paper based on the value of oil and gold may provide you with greater paper wealth in the interim, but after the Great Societal Implosion, you’ll likely be better off having a large store of canned goods.