UI is the point when interactions between machines and people happen. It lays down the parameters of a user's interaction with a machine.
Absolute Advantage
An economic theory in which one party produces or provides a particular good or service more efficiently than another party.
Falling Knife
The term falling knife (also known as "Catching a Falling Knife" or "Catching the Bottoms") refers to the action of buying an asset which is rapidly declining in price.
Ad Hoc
a Latin expression that means "for this purpose" or "specifically for this" in contemporary English.