Answer:
Landscapers, dry cleaners, and doctors are most likely to price their services based on function.
Psychologists, lawyers, and marriage counselors are likely to price their services based on time.
Explanation:
Landscaping, dry cleaning and provision of medical services (in the case of doctors) are mostly physical labor or manual work that require physical strength. As such, they chose to get paid for their services based on function. This is because the higher the function (like washing blankets in the case of dry cleaners) the more physical strength that goes into the job.
On the other hand, psychologists, lawyers, and marriage counselors mostly perform mental labor that requires great use of their intellect. Therefore they chose to get paid based on time. This is because they need time to figure out intellectual means of providing solutions to problems (in the case of psychologists and marriage counselors) or winning cases (lawyers). It is worthwhile to note that the time required to solve problems varies. This is why they charge based on time.
Answer: price
Explanation: The invisible hand uses the power of price to guide the market economy, price determine both the level of demand and supply in accordance with the the law of demand and supply.
