Commodities & FX

Equities and fixed income get most of the attention in a typical finance education. Commodities and currencies are just as real an asset class, and "what's your view on GBPUSD" or a question about oil markets is a genuinely common S&T and macro-fund interview topic that trips up candidates who've never thought seriously about either.

Commodities: hard, soft, and why they trade as futures

Commodities split broadly into hard commodities (extracted or mined — oil, gold, copper, natural gas) and soft commodities (grown or farmed — wheat, coffee, cotton, cattle). Almost nobody trading commodities professionally wants to take physical delivery of 1,000 barrels of oil — instead, the vast majority of commodity trading happens through futures contracts: an agreement to buy or sell a set quantity at a set price on a future date.

Futures let producers and consumers hedge real physical risk (an airline locking in future fuel costs; a farmer locking in a sale price before harvest) and let speculators take a view on price direction without ever touching a barrel of anything.

Contango and backwardation — the futures-curve concept worth knowing

Plot commodity futures prices against how far out they expire, and you get a futures curve, with two possible shapes:

• Contango: futures prices are higher than the current spot price — common when storage costs matter (you're paying someone to hold the physical commodity until you need it) or supply is currently ample.
• Backwardation: futures prices are lower than the current spot price — often signals near-term scarcity: the market is willing to pay more for the commodity right now than for delivery later, a real, urgent supply-demand signal.

This site's own Pokemon Cards module treats trading cards as a genuine collectible-commodity case study — real production data, a real price-volatility episode, and a direct comparison to a past physical-collectible market crash. Worth a look as a concrete, low-stakes example of commodity-like supply/demand dynamics before you apply the same thinking to oil or gold.

FX: the quoting convention that trips people up

A currency pair like GBP/USD = 1.27 means 1 British pound buys 1.27 US dollars. GBP is the base currency, USD is the quote currency. If GBP/USD rises, the pound has strengthened against the dollar. Every FX move is, by definition, about both currencies at once — there's no such thing as "the dollar went down" without some other currency going up against it.

Interest rate differentials — the single biggest driver of currency moves

This connects FX directly to the Central Bank Room on this site: money tends to flow toward the currency offering the higher real (inflation-adjusted) interest rate, because investors can borrow in a low-yielding currency, convert to a high-yielding one, and earn the spread — a strategy called the carry trade.

If the Fed holds rates meaningfully higher than the ECB, that tends to support USD strength against EUR, all else equal — real money is incentivized to hold dollar-denominated assets for the extra yield. This is why an FX trader watches central bank decisions as closely as an equity analyst watches earnings.

Worth knowing for an interview: carry trades work smoothly until they don't — a sudden shift in risk sentiment can cause a rapid, painful unwind, which is why "carry trades unwinding" is a recurring phrase in real market-stress episodes.

Purchasing power parity — the long-run anchor

Purchasing Power Parity (PPP) is the idea that, in the long run, exchange rates should adjust so the same basket of goods costs the same amount in any currency (the Economist's "Big Mac Index" is a real, simplified illustration). PPP is a genuinely poor short-term predictor — rates can deviate from it for years — but a real anchor over long horizons. A strong interview answer references both: PPP as the long-run gravity, rate differentials and flows as what actually moves a pair day to day.

Building an actual FX view — the interview-ready structure

1. Rate differential — which central bank is more hawkish right now (check real current policy rates in Central Bank Room, not a guess).
2. Growth differential — which economy's outlook is stronger.
3. Risk sentiment — "risk-on" typically favors higher-yielding currencies; "risk-off" favors safe havens (historically USD, JPY, CHF).
4. Flows and positioning — is there a structural reason capital is flowing into or out of one side?

Naming these four inputs, and being explicit about which one you're weighting most and why, is a dramatically stronger interview answer than a directional guess with no framework behind it.