How to Build Your Own Monthly Market Review — Without Going Mad From Information Noise

Every month something happened. A central bank said something. Earnings season brought a surprise. Geopolitics got complicated. Analysts revised estimates. And yet — if someone asks you in ten years whether this specific month affected your pension return, the probable answer is: no. So how do you approach a monthly market review in a way that is useful rather than anxiety-inducing?

Why you don't need most financial journalism

Financial media has one business model: keep you reading or watching. For that they need stories. But markets are 80% noise — random movements with no predictive value for the future. Media must interpret this noise as signal, otherwise they would have nothing to write about. Result: every 1–2% move gets an explanation, every decline is a dramatic "crash", every rise is an exciting "rally". But if you look at a 20-year chart of a stock index, you barely notice these movements — they are microscopic waves on a big wave.

That does not mean financial journalism has no value. It does — but a different kind of value than we usually look for when consuming it. A good news story says: this is a structural change that may persist for years. A bad one says: markets fell today because of X. Learning to distinguish these two is half the entire battle with information overload.

A practical test: take a statement from financial journalism and ask yourself — will this information change my strategy on a 10-year horizon? If not, it is noise. A Fed rate cut of 0.25% is information with a potential structural impact. The fact that Apple stock fell 2% today without a fundamental reason is noise. This distinction saves dozens of hours per year and probably improves returns by reducing the frequency of emotional decisions.

What to actually look for: a five-minute macrooutline

Every month it is worth looking at approximately five numbers or areas. Nothing more, nothing less:

• Performance of main indices: S&P 500, MSCI World (or IWDA as a proxy), MSCI Emerging Markets. How did they move over the month and over the year? Add Eurostoxx 600 for European context and Nasdaq 100 for technology sentiment.
• Inflation and rates: Where is the key Fed or ECB rate? Did it move? What are markets expecting in 6 months? This is the basic macrovariable that affects the valuation of both equities and bonds. Source: Fed website, ECB website or Bloomberg Free.
• Stronger or weaker dollar and euro: If as a Czech investor you have exposure in USD, currency movement will affect your CZK returns. Not dramatically in one month, but over a year the exchange rate matters, especially in a strong or weak CZK environment.
• Credit spread: Simplified — how high an interest rate differential do markets require for corporate bonds versus government bonds? If it rises, it is a signal of growing nervousness. Source: St. Louis Fed FRED database (ICE BofA US High Yield Option-Adjusted Spread), freely available.
• Earnings season (once per quarter): What was the summary of S&P 500 company results? Did they beat estimates or disappoint? What was the Y/Y revenue and earnings growth? Summaries can be found on FactSet Earnings Insight or Yardeni Research — both publish weekly updates for free.

How to read earnings season without losing your mind

Earnings season comes four times a year — companies report quarterly results. Media devote enormous space to it and every company that beat or missed estimates gets its own headline. What from this is relevant for a passive investor?

One number: what percentage of S&P 500 companies beat the consensus earnings-per-share estimate? Historically it is approximately 70–75% of quarters. If the number falls significantly below 60%, it is a signal of broader economic stress. If it is above 80%, the market is performing above expectations. That is all you need for a monthly review. Individual company results are relevant only if you hold the individual position or are considering buying.

Watch for one trap: markets react to surprises relative to expectations, not to absolute values. A company that reported great results may fall 5% because analysts expected even better. A company with an average quarter may jump because the market expected a disaster. This logic makes no sense for daily news reading but fully reflects how markets work as a mechanism discounting future expectations.

Geopolitics and macroeconomics: when to follow, when to ignore

Long-term investors have two strategies that complement each other:

• Ignore short-term geopolitics completely — markets have absorbed hundreds of geopolitical shocks, from world wars to oil embargos to the Covid pandemic, and always reached new highs. Selling on every shock is a proven path to returns worse than buy-and-hold.
• Follow structural geopolitics — deglobalisation of manufacturing, the energy transition from fossil to renewable, the demographic shift in developed and emerging economies. These are trends with a decade-long horizon, not days. Worth reading one quality analytical text per month, not watching daily news.

A practical heuristic: if news presents itself as urgent and asks you to act today, ignore it. Good structural analysis remains valid for months because it describes trends, not events.

How to close the review: one question that decides

After every monthly review, ask yourself one question: has anything changed that would force me to reconsider my long-term strategy? In 95% of months the answer will be no. Inflation moved 0.3%. Quarterly results beat estimates by 4%. The index fell 2% and then came back. None of this requires a change in a portfolio built on solid allocation and regular DCA.

If the answer is yes — something structural happened like a fundamental change in monetary policy, new regulation of an entire sector or a demographic shift — give yourself time. Read two or three longer texts, let the information settle for 48 hours, and only then decide. Reactive investing under the influence of fresh news is one of the most expensive behavioural patterns that retail investors repeat. A market review should calm you and reinforce the existing strategy — not prompt action. This is not investment advice, the index remains the starting point.