I believe the point is that if one puts their money in savings or bonds they either don't lose money in the long run, or they gain money. This is good because money in savings or bonds can be used by banks/governments/whatever to invest in new business and therefore promote the overall growth of material wealth because they provide sources of capital. Inflation encourages people to invest their money in such ways because if they were to instead bury their money in their backyard they would still have 4 cents today, meaning that they lost about 94 cents from 1910. If one invests money in gold, yes it is a slightly more safe investment, but it doesn't promote growth by allowing your money to be pooled as capital.
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I believe the point is that if one puts their money in savings or bonds they either don't lose money in the long run, or they gain money. This is good because money in savings or bonds can be used by banks/governments/whatever to invest in new business and therefore promote the overall growth of material wealth because they provide sources of capital. Inflation encourages people to invest their money in such ways because if they were to instead bury their money in their backyard they would still have 4 cents today, meaning that they lost about 94 cents from 1910. If one invests money in gold, yes it is a slightly more safe investment, but it doesn't promote growth by allowing your money to be pooled as capital.