What conditions support democratic institutions in creating a stable civilian government?

The conditions that support democratic institutions in creating a stable civilian government are as follows:

1. Education and Literacy: A well-educated society is not only more productive but is also able to make better decisions for governance. 

2. A Strong Middle Class: A more educated society will be able to work in higher-paying jobs. While an elite rich class and a poor working class are the norm in every society, the idea for every government is to ensure that the Middle Class is expanded and the extreme of both rich and poor are decreased.
A strong middle class is the back-bone of every society.

3. Opportunity for Advancement: Every person, regardless of race, class, religion should have an equal opportunity to get an education, find a job, start a business and advance in life.

These 3 conditions support a stable civilian government and should ensured by democratic institutions.