In an Economy, If ex-ante Aggregate Demand is more than ex-ante Aggregate Supply $\left(\mathrm{AD}>\mathrm{AS}\right)$, it means that households are spending more than the flow of goods and services in the economy.
Effect on output: To meet the increased demand in the economy, producers will plan to increase the production. So, Output will rise in the economy.
Effect on Employment: To increase the output, producers will apply additional resources (labour). So, employment will increase in the economy.
Effect on Income: Increase in employment level will lead to the creation of more job opportunities. It will increase the income level in the economy.