In the context of economic growth, productivity plays a vital role in enhancing a country's output without necessarily increasing the input factors such as labor and capital. When productivity increases, it implies that the economy can produce more goods and services with the same level of resources. Key factors influencing productivity include technological advancements, improved workforce skills, and increased capital investment.

Consider the following scenarios related to productivity:

1. A manufacturing firm implements cutting-edge robotics in its assembly line, significantly reducing the time and labor required to produce each unit.

2. A national government invests in higher education, which raises the skill level of workers across various industries.

3. A company raises its wages significantly without changing its technology or methods of production.

Now, based on these scenarios, which action is most likely to result in a positive and sustained increase in overall productivity?