Which of the following is not a feature of socialism?1. Central economic planning2. Equal distribution of income3. Presence of market forces4. More attention to collective social interest than personal gains.

To determine which of the options is not a feature of socialism, we will analyze each one:

1. Central economic planning: This is indeed a feature of socialism. In a socialist system, the government or a central authority typically plans and controls the allocation of resources and production.

2. Equal distribution of income: This is also a feature of socialism. Socialism aims to reduce income inequality by ensuring a more equitable distribution of wealth among the population.

3. Presence of market forces: This option is the one that is not a feature of socialism. Unlike capitalism, socialism tends to limit the role of market forces in the economy. Instead, it emphasizes collective decision-making and planning.

4. More attention to collective social interest than personal gains: This is another feature of socialism. Socialism prioritizes the well-being of society as a whole over individual profit or personal gains.

Therefore, the correct answer is option 3: Presence of market forces.