Dear Carrie: I’m a single mom with a decent income, but I’m always living paycheck to paycheck. How can I break that cycle and start to save, not only for an emergency but also for my bigger goals like retirement and maybe even a home?—A Reader Dear Reader: Living paycheck to paycheck isn’t uncommon these days. Recent studies suggest many Americans are doing just that, which makes it next to impossible to save and invest. Overspending can be part of the problem, but even more often, people get squeezed through no fault of their own—low wages, unpredictable income, and high costs for essentials like childcare, health care, housing, and college. On the other hand, even people with high incomes can find themselves caught in a seemingly never-ending cycle. When you’re in this situation and just barely making ends meet each month, it can seem as though you’re on an endless …