Investment Asset Classes: Stocks, Bonds, Commodities, Crypto and Cash Explained

Equities — also called stocks or shares — represent fractional ownership of a company. When you buy a share of a company, you become a part-owner entitled to a proportional claim on its future profits (dividends) and its residual value if it were liquidated. Equity returns come from two sources: price appreciation (the market price of the share increases) and dividends (the company distributes a portion of its profits to shareholders).

Historically, global equities have been the highest-returning major asset class over long horizons. The MSCI World index, which tracks large and mid-cap companies across developed markets, has delivered approximately 8–10% annualised returns over the past 50 years in USD terms, though with substantial volatility. This risk-return relationship is fundamental: equities carry higher risk (volatility, potential for significant drawdowns) because investors demand a premium to hold them over safer alternatives like government bonds.

Equities are further subcategorised by geography (US, European, Emerging Markets), market capitalisation (large-cap, mid-cap, small-cap), style (growth vs value), and sector (technology, healthcare, financials, energy, etc.). Each subcategory exhibits different return drivers and different correlations with other categories. For portfolio tracking purposes, each equity position should be tagged with its ISIN, geographic exposure, and sector allocation — DonkyCapital automatically enriches equity holdings with this data where available.

Bonds are debt instruments: when you buy a bond, you are lending money to an issuer (a government or corporation) in exchange for regular interest payments (coupons) and the return of the principal at maturity. The key variables are: the coupon rate (the fixed interest rate paid on the nominal value), the maturity (when the principal is returned), the credit rating (the issuer's assessed ability to repay), and the yield (the actual return you receive, which moves inversely to the bond's price).

Bonds have historically served two functions in a portfolio: income generation (coupons provide predictable cash flows) and diversification (government bond prices often rise when equity prices fall, providing a buffer during equity market downturns). This negative correlation between equities and high-quality government bonds from roughly 2000 to 2021 was the intellectual foundation of the 60/40 portfolio. During the 2022 inflation shock, this correlation turned positive — both asset classes fell simultaneously — demonstrating that bond-equity correlation is not a constant and must be monitored.

Bond subcategories include: sovereign bonds (issued by governments — generally the safest), investment-grade corporate bonds (issued by financially strong companies), high-yield bonds (issued by lower-rated companies with higher credit risk and higher yields), inflation-linked bonds (coupons and principal adjust with inflation), and covered bonds. Duration is the key risk metric: a longer-duration bond is more sensitive to interest rate changes. When tracking bonds in DonkyCapital, entering purchase price, coupon, and maturity date allows accurate calculation of yield to maturity and correct performance attribution.

Commodities are raw materials and primary goods: energy (oil, natural gas), metals (gold, silver, copper), agricultural products (wheat, corn, soybeans), and livestock. Unlike equities and bonds, commodities do not generate income (no dividends, no coupons) — their return comes entirely from price changes driven by supply and demand dynamics.

The primary portfolio rationale for holding commodities is inflation protection and diversification. Commodity prices tend to rise during inflationary periods (because commodities are the inputs that drive inflation), making them a partial hedge against purchasing power erosion. Gold in particular has a long history as a store of value and tends to perform well during financial market stress, geopolitical uncertainty, and periods of negative real interest rates.

Retail investors typically access commodities through ETFs (physically backed for precious metals like gold and silver; futures-based for energy and agricultural commodities) or commodity producer equities (which add equity market risk to commodity price exposure). Physically backed gold and silver ETFs — such as iShares Physical Gold (IGLN) or Xetra-Gold — can be tracked as individual positions in DonkyCapital by entering the ISIN, treating them like any other ETF holding.

Important caveat: futures-based commodity ETFs suffer from "roll cost" — when the near-month futures contract expires and must be replaced by the next-month contract, and the new contract is more expensive (contango), the fund loses value in the roll. This can create significant divergence between the performance of a commodity futures ETF and the spot price of the commodity. This is why many investors prefer physically backed vehicles for precious metals and avoid long-term holdings in energy-commodity futures ETFs.

Cash and cash equivalents — savings accounts, money market funds, short-term Treasury bills, certificates of deposit — are the lowest-risk, most liquid asset class. They preserve nominal capital but are subject to inflation risk: holding cash in a savings account paying 2% when inflation runs at 4% results in a real (inflation-adjusted) loss of approximately 2% per year. This is the "cost of safety."

Cash serves several legitimate functions in a portfolio: it provides liquidity for near-term spending needs that cannot be exposed to market risk; it acts as dry powder for opportunistic purchases during market downturns; and it reduces overall portfolio volatility. The debate between investors is always how much cash to hold — too much creates drag and purchasing power erosion; too little leaves no buffer for emergencies or opportunities.

Money market funds — which invest in very short-term, high-quality debt instruments — offer slightly higher yields than bank savings accounts while maintaining liquidity and capital stability. In the European context, UCITS money market funds (like the ones from Amundi or BlackRock) are popular for parking short-term savings. When tracking money market fund positions in DonkyCapital, enter them as you would any other fund using the ISIN, with the purchase price and current price reflecting the stable NAV and any yield accrued.

Cryptocurrencies — Bitcoin, Ethereum, and thousands of alternative coins — are digital assets that operate on decentralised blockchain networks. Unlike other asset classes, they have no underlying cash flows, no physical backing, and no government guarantee. Their value derives from network effects, scarcity (Bitcoin has a hard cap of 21 million coins), speculative demand, and increasing use as a medium of exchange or store of value.

Cryptocurrencies are the highest-volatility and highest-risk mainstream asset class. Bitcoin's annualised volatility has historically been 60–90%, with drawdowns exceeding 80% from peak to trough during bear markets. This makes them unsuitable as a large portfolio allocation for most investors, but potentially interesting as a small satellite position (1–5% of a diversified portfolio) for investors with a long time horizon and high risk tolerance.

The portfolio diversification case for Bitcoin rests on its historically low correlation with equities and bonds over long periods, although this correlation has increased during recent market stress events (in early 2020 and again in 2022, Bitcoin sold off alongside equities). Correlations with traditional asset classes remain unstable.

For tracking purposes, DonkyCapital supports cryptocurrency as an asset class. When entering crypto positions, use the coin's ISIN if available (exchange-traded crypto products like Bitcoin ETPs are increasingly listed with ISINs on European exchanges) or treat it as an unlisted asset with manual price updates. Accurate cost-basis tracking is especially important for cryptocurrency due to the complex tax treatment — in most European jurisdictions, each disposal (sale, swap, or spending) is a taxable event.