Final answer:
Before the birth of each child, the Mitchells' investment time horizons differ. Having two children will place financial challenges on their retirement objectives.
Step-by-step explanation:
Before the birth of each child, Steve and Jane Mitchell's investment time horizons will differ. Prior to the birth of their first child, their investment time horizon would be long-term, as they have many years until retirement and can afford to invest more aggressively. However, immediately subsequent to the birth of their first child, their investment time horizon may shrink as they need to allocate funds for their child's education and other immediate expenses.
Having two children will place financial challenges on the Mitchells' retirement objectives. They will need to save and invest more to cover the costs of supporting two children through college, as well as their own retirement. One approach to meeting these challenges is for the Mitchells to invest more aggressively during their earlier years to maximize growth. This means they may take on higher risks and allocate more of their investments in stocks or other higher-yield assets. However, they should also consider diversifying their investments to mitigate risks.