READING A QUOTE — AND WHAT THE ROUND TRIP COSTS

Bid, ask, last, fill: the four numbers on every quote, and the round-trip arithmetic that quietly decides whether a strategy can survive its own costs. Read a quote like a shop window with two prices: what the shop will pay you for your item (the bid) and what it charges for theirs (the ask). The ‘last’ is the price of the most recent sale — to somebody else, possibly minutes ago, in a different size. Your receipt — the fill — is the only price that ever applied to you.

QUOTES & FILLS · STAGE 2 · LESSON 6

THE TAKEAWAYS

• Quotes also carry size: how many contracts stand at the bid and at the ask. If your order is bigger than the size shown at the best price, the remainder fills deeper into the book at worse prices — one more reason this course trades small and liquid.
• Slippage is the difference between the price you expected when you decided (the quote, or your midpoint plan) and the price on your fill. It is a real, measurable leak — Stage 4 onward, it goes in the journal for every trade, paper or real.
• Fees are the small, honest part: $0.65 per contract per side on Fidelity's published schedule (checked Oct 15, 2026) is $1.30 per contract per round trip; a $0-per-contract broker collects its share through order flow instead (Lesson 1). Either way, the spread is usually the bigger toll.
• Friction is expectancy drag: costs are certain, any edge is hypothetical. A trade that pays $16.30 of friction on a $2,060 premium spends 0.8% before it starts — survivable. The same habit on a cheap, wide contract can spend a sixth of the position. Friction is a Stage 4 sizing input, not a footnote.

WORKED EXAMPLE — STEP BY STEP

1. The quote (real, Oct 9, 2026, about 12:05pm CT): SPY 773 call — bid 20.53, ask 20.68, spread 0.15, midpoint 20.605. Premium at the ask: $2,068 per contract; at the midpoint: $2,060.50. The graphic prices the round trip off these four numbers.
2. Worst-case round trip (market orders both ways): buy at the ask 20.68, sell at the bid 20.53 → the spread costs 0.15 per share = $15 per contract. Add contract fees at $0.65 a side = $1.30. Total friction ≈ $16.30 per contract.
3. As a percentage: $16.30 on a $2,060 premium ≈ 0.8%. That is the SPY discount — the deepest options book in the market (Stage 1) keeps its friction in the fractions of a percent.
4. Disciplined round trip (limit orders walked from the midpoint): fills near the midpoint both ways → spread cost ≈ $0, friction ≈ the $1.30 of fees alone. Lesson 4's limit habit is worth roughly $15 per contract per round trip on this quote — every trade, win or lose.
5. Now the formula on a cheap contract — the lesson's example numbers: a $2.00 premium quoted $0.30 wide. Friction ≈ $0.30 spread + $0.013 of fees per share ≈ $31 per contract on $200 of premium ≈ 15.7%. Same trader, same habit, different contract: the toll went from under 1% to a sixth of the position. That is why this course hunts liquid contracts in the 0.50–0.65 delta shelf and runs this arithmetic before entry, not after.

THE STAGE 2 GATE — WHAT ‘DONE’ LOOKS LIKE

This stage's gate, in the course's application style — no P&L thresholds, ever: (1) on a paper account, place each order type from Lessons 4–5 correctly — a market order, a limit at the midpoint, a stop-market, a stop-limit — and keep each fill report or working-order screenshot; (2) from any real chain quote, compute the round-trip friction in dollars and as a percentage of premium, worst case and at the midpoint; (3) state, in one sentence each, when a market order is unacceptable — wide spread, thin book, pending news, any option order. Keep the screenshots and the arithmetic in your journal. Stage 3's charts are next, and Stage 4 will grade your position sizing with this friction inside it.

COMMON BEGINNER MISTAKES

• Reading ‘last’ as the price you'll get. Last is history; the bid/ask is the present tense.
• Counting the entry spread and forgetting the exit has one too — friction is a round-trip number.
• Judging a cheap contract by its premium and never by its spread as a percentage of that premium.
• Never reading fill reports — never comparing the fill you got with the midpoint your own plan was owed.

CHECK YOURSELF

DO IT — THE ROUND-TRIP RECEIPT

Open the SPY chain. Pick the first call with delta between 0.50 and 0.65; note the date and time; write its bid and ask in your journal. Compute: the spread, the midpoint, the worst-case round-trip friction in dollars (spread × 100, plus your broker's per-side contract fee twice — $1.30 total at a $0.65 broker), and that friction as a percentage of the premium. Then repeat for the cheapest call on the chain and compare the two percentages. You have just done the single most useful calculation in Stage 2.