Every price on every chart exists because a buyer and a seller agreed to trade at that level. Prices move because that balance shifts — when more market participants want to buy than sell at the current price, the price rises to find new sellers. When more want to sell than buy, it falls to find new buyers.
The Order Book Behind the Chart
Behind every candle is an order book: a stack of pending buy orders (bids) below the current price and pending sell orders (asks) above it. When a large buy order eats through all the sell orders at one price level, the price has to move up to the next level where sellers are waiting.
This is why price often moves in a jerky, uneven way rather than a smooth line — it's constantly hunting for enough liquidity on the other side to fill incoming orders.
What Creates Imbalances
- ▸Economic news and data releases that change expectations overnight
- ▸Large institutional orders that need to be filled regardless of price
- ▸Shifts in sentiment, such as fear during a crisis or greed during a rally
- ▸Central bank decisions that change the relative attractiveness of holding a currency
- ▸Technical levels where many traders place similar orders, creating clusters
Why This Matters for Chart Reading
Technical analysis works because it's essentially a proxy for supply and demand. Support and resistance levels are places where past imbalances occurred — where buyers or sellers previously stepped in with enough force to turn price around. Traders watch these levels because there's a reasonable chance similar behavior repeats.
Chart patterns aren't predictive because they're mystical — they work (when they work) because they reflect recurring human and institutional behavior around supply and demand at specific price levels.
Liquidity: The Fuel for Movement
Liquidity refers to how easily an asset can be bought or sold without significantly moving its price. Highly liquid markets, like major forex pairs, have deep order books — large trades barely move the price. Illiquid markets can swing sharply on relatively small orders because there simply aren't enough participants on the other side.
A Practical Example
Imagine a central bank unexpectedly raises interest rates. Higher rates make holding that currency more attractive to investors seeking yield. Demand for the currency increases immediately, while the supply of willing sellers at the old price shrinks. The result: the currency's value jumps until a new balance is found at a higher price.
Takeaway for Traders
You don't need to see the order book to trade well, but understanding that price is always a tug-of-war between buyers and sellers helps you interpret charts more intelligently. Ask yourself: who is in control right now, and what would make that change?