Fundamentally speaking, the level of demand at any given time is the key factor in the determining the value of coins. However, it is safe to assume that the value of mass-produced coins will not rise in the future. If coins have been minted millions of times, they are of no real value for collectors. In the case of rare coins and coins from countries that are relatively new for collectors, it is possible for trends to develop that will push up demand again. However, this is very difficult to predict. Apart from the question of how much a coin is worth to collectors, its value can also change with the rise and fall of metal prices.