[Solved] CFDs are both OTC and exchange-traded. Invisible: Something not visible to the naked eye or not easily noticed or recognized despite being present. Ageism: Refers to prejudice or discrimination against individuals based on their age. Activism: Initiatives aimed at supporting, obstructing, guiding, or interfering in social, political, economic, or environmental change with the objective of altering societal norms. Catalyst: A substance that increases the rate of a chemical reaction without itself undergoing any permanent chemical change.