they calculate risks, make predictions, make or break nations/civilisations. for instance actuary studies is one branch of calculating risks in economics.
country-specific; however, almost all processes share a rigorous schooling or examination structure and take many years to complete (Feldblum 2001, p. 6, Institute and Faculty of Actuaries 2014). ...
Actuaries use skills primarily in mathematics, particularly calculus-based probability and mathematical statistics, but also economics, computer science, finance, and business. For this reason, actuaries are essential to the insurance and reinsurance industries, either as staff employees or as consultants; to other businesses, including sponsors of pension plans; and to government agencies such as the Government Actuary's Department in the United Kingdom or the Social Security Administration in the United States of America. Actuaries assemble and analyze data to estimate the probability and likely cost of the occurrence of an event such as death, sickness, injury, disability, or loss of property. Actuaries also address financial questions, including those involving the level of pension contributions required to produce a certain retirement income and the way in which a company should invest resources to maximize its return on investments in light of potential risk. Using their broad knowledge, actuaries help design and price insurance policies, pension plans, and other financial strategies in a manner that will help ensure that the plans are maintained on a sound financial basis (Bureau of Labor Statistics 2015, Government Actuary's Department 2015).
https://en.wikipedia.org/wiki/Actuary
Without their theories in practice applied to things like insurance, we'd be all poor due to no insurance, trade, IMF, export/import, stock market, companies, these people make the world work or not. They also have cutthroat insights into human beh. for instance market research is an area of economics. The kind of scientific market research results obtained is the reason why they can brainwash the masses.
Only recently like in the last decade or so is the field of medicine starting to adopt economic principles. Things like clinical trials, preregistrations, cost-benefit analysis, decision-analysis, evidence-based (statistical/bayes) medicine are derived from economic principles. My friend was calculating risks using bayesian principles in first year macroeconomics or something twenty years ago, she talked to me about it and I remember the only thing I was thinking about as a sordid neuroscience major was raiding her college oven for chicken wings.. whereas in fields like medicine, only in the last decade or so these stupid-ass doctors are starting to understand why scientific prediction tools have better outcomes for patients. I studied with doctors and they struggled to wrap these concepts/make calculations/assess decisions around their rote-learnt mofo minds, whereas I find mathlete brainiacs who tend to study economics have no problem with it.
And as years go, these doctors become like plumbers who can memorize big words, marginalize some patients whatever, hands systematically grope and ignore patients, with nothing up there dumber and dumber, sort of like scientists who get better at mincing words, mince formulas, collaborate with 101 juniors who do their work for them, dabble scifi headlines for publication fame fortune, make a name, metric, H-impact whatever, whereas I find economists take on the responsibilities of making the world work.