Inequality and macreconomic development

[Eddie93]

Hello all,
some scholars consider emerging inequalities of income as a factor for macroeconomic instability. Now my source posted that comparisons of status and sorrow about the relative status in society are a very important part of this. Can you explain me the link between inequality of income and macroeconomic instability? I consider debts of private households and imbalances of the balance of avtivities as the link (since they are a result of inequalities of incomes). But I do not get a proper argumentation out of this.
As second point: How do comparisons of status and sorrow about the relative status fit in here?
Thank you for your help

Eddie