Answer:
There are others, but the main advantage of a homogeneous culture that I can think of is this: Simply, people trust one another implicitly and easily due to a basic day-to-day understanding of each other’s humanity.
When a group has all grown up with the same media, and in roughly the same conditions, and with roughly the same manners and understanding of the way the culture’s systems work, it is easy for them to empathize with each other. People tend to be kinder to those whom they understand well, and in a homogeneous culture, you understand most people pretty well.
When a slight is committed, others tend to be more charitable to the perpetrator. In these cultures, there is a general belief that people are largely “good” with only a few “bad apples” to blame for most of society’s problems.
The disadvantage to this is that since most people are brought up similarly, they think similarly. There is little room for innovation or free thought, and in some cases those who don’t toe the line will find themselves ostracized.
This leads to a general stagnation of the society and possibly an amplification of humanity’s natural xenophobia and racism.
These conclusions are all drawn from my experiences here in Japan, and may not translate to other homogeneous cultures. In fact, I wouldn't be surprised if there were multiple examples of the exact opposite of this.
That’s the problem with this sort of question - it requires generalization beyond the point of usefulness. It’s a bit like asking “What does soup taste like?” There is no one answer.
Explanation:
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