Market share is crucial in marketing, but there is a minimum value below which it's not practical to think about it. Different experts have discussed this concept, with some focusing on significant vs. trivial market shares, threshold market share, and important market share. The minimum market share can indicate an industry being dominated by a few big players or be crucial for survival and entry barriers. In some cases, the minimum market share of the leading firm can become the maximum, while the minimum for survival becomes the share of the smallest viable firm in the industry.