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There are at least five reasons why silver has far greater potential to increase than gold. Most important of these being current gold:silver ratio and current production levels.

I also believe silver has a greater potential to increase than gold. Less than 17usd an ounce is insanely low. Mining of silver is almost over but the demand will remain (IT, medical, solar panels, ...).
I strongly believe the low rating is manipulated by traders with paper silver (and not real metal silver).