There are many concepts in the social sciences that are measured using multiple indicators. Such concepts have been called by Blalock (1968) concepts-by-postulation because one needs a theoretical argument to define them. Within the set of concepts-by-postulation. a distinction has been made between concepts with reflective indicators and concepts with formative indicators. https://fitnessgravesyardes.shop/product-category/power-resistance-with-wire/