On the usage of Gas and Price Volatility

From the Libra Blockchain whitepaper, section 3.1:

This approach differs from some existing blockchains, which target validators with lower capacity and thus at times have more demand to process transactions than throughput. In these systems, fees spike during periods of high demand — representing a revenue source for the validators but a cost for the users.

A stable nominal Libra price would be negated by volatility in the price of gas if it were to fluctuate in a manner that the designers do not intend. This fluctuation could extend to the nominal price of a Libra – if its transaction costs were to rise above the cost to move/exchange fiat, exchange spreads could widen undesirably. Can someone knowledgeable on this topic help me understand how gas spikes are avoided, specifically?

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