Scarcity is when a resource or service becomes less available. The decreased availability means that demands exceeds supply, causing the price to increase.
A very good example of technology that increased productivity is the smartphone. It allows users to browse the internet, check time, communicate and keep notes, decreasing the need for many separate devices.
A pause can be used to give emphasis to a certain point. The pauses can also be used to single out a certain sentence and those sentences are what later get quoted in newspaper articles or people what people use to refer to the speech in question.
