Before picking a stock or a fund, pick a horizon. It is the most structural decision in a portfolio — and the one most beginners gloss over. Investing for 12 months and for 10 years requires different tools, expectations, and risk tolerance.
Short term: under one year
Over a few weeks to a few months, the dominant factors are liquidity, market sentiment, and one-off news. A good company's stock can fall for three months for reasons unrelated to fundamentals: capital flows, rumours, institutional repositioning.
At that horizon, equities are rarely the right vehicle. For savings you may need quickly, a money-market OPCVM or a remunerated savings account is more appropriate.
Mid term: one to five years
Fundamentals matter more here, but volatility is still meaningful. A balanced portfolio (50-60 % equities, 30-40 % bonds / OPCVMs, the rest in money market) is often the right compromise. Sectoral diversification becomes critical because a bad concentration can weigh on returns for two years without self-correcting.
This is the typical horizon for a specific project: a property purchase in four years, education funding in three years, a wedding. The firmer and more dated the project, the lower the equity share should be as it approaches.
Long term: five years and beyond
Past five years, equities become statistically the best risk-adjusted vehicle. The probability of loss over a 10-year window is historically very low for a diversified portfolio. Compounding kicks in: a 6 % annual return roughly doubles capital in twelve years.
This is also the horizon where discipline dominates. Holding through drawdowns is harder than picking the right name.
Horizon-instrument coherence
A classic mistake: putting money you'll need in 18 months into volatile stocks. The market may well be down precisely when you need to sell, forcing a loss. The golden rule: money placed in equities should be money you can "forget" for 5 years.
In practice
Before every purchase, ask three questions: what is my horizon, what temporary drawdown can I tolerate without selling, and what will I do if the market drops 30 %. The answers structure your allocation better than any specific stock pick.