Advantage enrichment effect is a starting point development theory, which means that the small advantage at the starting point will produce a greater level of advantage accumulation through the series amplification of the key process.
According to the above definition, which of the followings is not dominant enrichment effects:
In order to expand its business, an education and training institution, like other training institutions, publicized by sending leaflets. Later, with the continuous expansion of its scale, the service quality also rose to a higher level and became a model in the industry