An oligarchy is defined by a small group of people having control of the entire country, rather than the whole population of the country ruling it jointly. In a way, in my opinion, the US was an oligarchy during slavery: as people of colour and women didn't have voting rights.
Costs/Socioeconomic status: Many areas have medicine and treatments that are expensive and unaffordable for average citizens. Those in poverty or simply below a specific wage level tend to risk going into more debt with ongoing treatments.
Lack of research and communication: A prime example would be the LGBTQ+ community. With a lack of communication and discrimination towards LGBTQ’s, it is harder to disclose important information and connecting certain diseases to specific groups of people.
one example is the many colonies they had for gold and other natural resources.
When judgments or decisions are influenced by the way in which information is presented, this is called a framing effect.
The term framing effect is an important concept in behavioral economics and psychology. It states, that people react to a particular choice in different ways depending on how it is presented.