What amount do you classify as much capital. To start your investment you dont need an actual amount to start it, all you need is a stable job, an income, and a discretionary income from your actual income. With time you can have more passive income to increase the percentage of your discretionary income you do invest with, that is if you are using the dca strategy. However, most rich people prefer to lump sum, since they do not want to hesitate in having a good amount in their portfolio
You don't need a stable job to invest. You need a source of discretionary income to invest. There are many people whose source of income is not stable. You need to find discretionary income from your source of income.
There are many people who invest but they don't have a stable source of income. For example, when a contractor takes a job, you don't get paid until the work is completed. There are many types of jobs where you don't get paid until the work is completed. If they want, they can find discretionary income and invest through proper financial management.