✔ 最佳答案
1. See below:
Market share - the portion of a particular product/brand/company in the entire market.
For example, among smartphone users, 60% of them use iPhone, 30% of them use Android, 10% of them use Blackberry. By this, you can say Apple's market share for smartphone is 60%.
Market growth - the increase of market given a period of time.
Continue with the example above. After a year, 50% of them use iPhone, 40% of them use Android, 10% of them use Blackberry. The market growth for Android will be 10%
2. Unless you can find neutral statistics or survey result, there is no way.
It is common that market share/market growth has been exaggerated.