In the industrial revolution it was the ability of mechanisation to increase productivity. That led to excess goods which made them available to people with lower incomes, and removed the need for almost literally everyone to be a farmer of some sort.
More recently, as you mention WiFi, it is the ability to rapidly share new information in literal seconds, and with computers the added ability to respond to changes automatically faster than a human can even read the output.
This takes those machines from the industrial revolution and turns it up to 11 in terms of how fast things can advance.
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