It seems odd the more people of a certain blood type would sustain injuries requiring blood, or that people of a certain blood type would care more about blood donation
So if the people who heard about blood banks and were interested, and the people who needed them are nearly randomly distributed in the population, I would expect the demand vs supply of each type to average out to the same figure.
However, I have heard blood banks ask specifically for people with rare blood types to donate, so it would appear that this theory is wrong. Alternatively, there is an equal shortage of all types, and someone in marketing thought that the specification would attract more people. (Even though if I was going to use the dark arts to make a group more likely to come, I would target the largest one)
It seems odd the more people of a certain blood type would sustain injuries requiring blood, or that people of a certain blood type would care more about blood donation.
For the same reason donating organs if one is mixed race is worth more (than organ donations by individuals of predominantly monoracial ancestry) because of complications in compatibility for the demographic.
The reason for this is the compatibility of the blood types, for example O-negative-blood can be donated to everyone and is therefore used in emergencies where the blood type of the recipient is not known.
It seems odd the more people of a certain blood type would sustain injuries requiring blood, or that people of a certain blood type would care more about blood donation So if the people who heard about blood banks and were interested, and the people who needed them are nearly randomly distributed in the population, I would expect the demand vs supply of each type to average out to the same figure.
However, I have heard blood banks ask specifically for people with rare blood types to donate, so it would appear that this theory is wrong. Alternatively, there is an equal shortage of all types, and someone in marketing thought that the specification would attract more people. (Even though if I was going to use the dark arts to make a group more likely to come, I would target the largest one)
Blood types vary by ethnicity, SES varies by ethnicity, injuries and donations vary by SES.
For the same reason donating organs if one is mixed race is worth more (than organ donations by individuals of predominantly monoracial ancestry) because of complications in compatibility for the demographic.
The reason for this is the compatibility of the blood types, for example O-negative-blood can be donated to everyone and is therefore used in emergencies where the blood type of the recipient is not known.