Understanding Bid, Ask, and Last Prices
Definitions
- Bid Price: The highest price a buyer is willing to pay for an asset (top of the buy order book).
- Ask Price: The lowest price a seller is willing to accept (top of the sell order book).
- Last Price: The most recent transaction price recorded in the market.
- Spread: The difference between the bid and ask prices, indicating liquidity and trading costs.
How Prices Are Determined
- Bids and asks are derived from the order book (a real-time list of buy/sell orders).
- The last price reflects historical transactions but may not represent current executable prices.
Bid Price vs. Ask Price vs. Last Price: Practical Scenarios
Following Bid Prices
Best for sellers executing market orders.
Example: Take Profit Order
- Buy 1 ETH at $100; set Take Profit at $105 (+5%).
ETH rises:
- Bid price reaches $105 → Order executes.
- Note: If bid lags behind last price (e.g., bid at $103 while last price hits $105), the order may not trigger.
Example: Stop Loss Order
- Buy 1 ETH at $100; set Stop Loss at $95 (-5%).
ETH drops:
- Bid price hits $95 → Order executes.
Following Ask Prices
Best for buyers executing market orders.
Example: Take Profit Order
- Buy 1 ETH at $100; set Take Profit at $105.
ETH rises:
- Ask price matches $105 → Order fills.
Example: Stop Loss Order
- Buy 1 ETH at $100; set Stop Loss at $95.
ETH declines:
- Ask price drops to $95 → Order triggers.
Following Last Prices
Common for charting but less reliable for live trading.
- Charts typically display the last price, but this may not reflect current bid/ask.
- Analogy: Selling a house listed at $350K. After negotiation, the "last price" is $335K—different from initial ask/bid.
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Why Stop Orders Don’t Always Trigger
Price Discrepancies:
- A spike to $50 (last price) might leave the bid at $40 if no buy orders exist above that level.
- Example: Market buys exhaust orders up to $50, but the highest remaining bid stays at $40.
Latency Issues:
- Exchange delays (0–10 seconds) can prevent timely order placement.
Liquidity Gaps:
- Thin order books exaggerate spreads, causing missed triggers.
FAQs
Q: Which price should I track for day trading?
A: Bid/ask prices for live execution; last price for trend analysis.
Q: How can I avoid stop-loss failures?
A: Use tighter spreads, check liquidity, and account for latency.
Q: Does the last price affect my limit orders?
A: No—limit orders rely on bid/ask prices matching your specified level.
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Key Takeaways
- Bid/Ask: Critical for live trades; represent executable prices.
- Last Price: Useful for charts but may lag in fast markets.
- Optimize Orders: Align stop/take-profit levels with bid/ask to reduce slippage.
Always monitor order book depth and market conditions to refine your strategy.
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