Answer: €45

## Explanation To understand which buy order would make a new market, we need to analyze the current order book: **Current Market Structure:** - **Bid side (buy orders):** €44, €42, €41 - **Ask/Offer side (sell orders):** €48, €47, €46 **Current Market:** - **Best Bid:** €44 (highest price buyers are willing to pay) - **Best Ask/Offer:** €46 (lowest price sellers are willing to accept) - **Current Bid-Ask Spread:** €46 - €44 = €2 **Analysis of Options:** 1. **€43:** This price is below the current best bid of €44, so it would not improve the market. It would simply be added to the bid side below the existing bids. 2. **€44:** This price equals the current best bid, so it would not create a new market. It would just add to the existing bid at €44. 3. **€45:** This price is above the current best bid of €44 and below the current best ask of €46. A buy order at €45 would: - **Improve the bid price** from €44 to €45 - **Narrow the bid-ask spread** from €2 to €1 (€46 - €45) - **Create a new market** with Best Bid = €45 and Best Ask = €46 **Why €45 makes a new market:** A new market is created when a buy order is placed at a price higher than the current best bid, or when a sell order is placed at a price lower than the current best ask. Since €45 is higher than the current best bid of €44 but still lower than the best ask of €46, it improves the bid side and creates a new, tighter market. **Key Concept:** In market microstructure, "making a new market" refers to improving the current bid or ask price, thereby narrowing the spread and providing better liquidity to the market.

Author: LeetQuiz .