A detailed analysis conducted by BusinessLeague.com over a 31-month period (January 1, 2024 – July 31, 2026), covering 1,236,336 unique orders placed across 43 online stores (ranging from major bookstores to niche publishers), reveals the underlying mechanisms of online book purchases. With a total generated value of €29.8 million (excluding VAT) and over 25 million affiliate-referred clicks, the report highlights exactly where the battles for conversion are being fought.

Here are the most important takeaways that every e-commerce manager or marketer in the Book category needs to know:

1. Mobile Dominates Volume, But Desktop Delivers the "Heavy Orders"

While mobile purchases have steadily grown—from 77.3% in 2024 to 81.1% in the first 7 months of 2026—transaction value is heavily influenced by the device and operating system used:

• Android generates the most orders (57.3% of volume) but has the lowest median cart value: €15.55.
• iOS (iPhone & iPad) accounts for 22.3% of orders, with a median value of €17.03.
• Mac OSX, despite representing just 2.1% of total volume, stands out significantly with a median order value of €27.96.

[!NOTE]
The Mac Effect: A desktop Apple OS user spends 80% more per cart than an Android user. This difference is not driven by the price of the chosen books, but by volume: desktop remains the preferred screen for large orders with multiple titles purchased at once.

2. Cart Size: Nearly 6 in 10 Orders Contain More Than One Book

Unlike other e-commerce categories where single-item purchases overwhelmingly dominate (such as Home & Garden), buyers in the Books category tend to group products to offset shipping costs or take advantage of bundle promotions.

The average is 2.88 products per order, and the distribution breaks down as follows:

• 1 single product: 41.1% of orders
• 2 products: 21.6% of orders
• 3 - 5 products: 25.2% of orders
• 6 or more products: 12.1% of orders.

3. Peak Hour is at 21:00. When Do People Buy the Most Books?

Purchasing behavior closely mirrors the daily schedules of Romanian consumers:

• Working Hours (10:00 - 18:59) account for 51.9% of orders, with volume remaining steady throughout the workday.
• Evening (19:00 - 23:59) brings in 29.7% of orders, but this is where we see the sharpest traffic peaks. The category's golden hour is 21:00 (over 82,000 cumulative orders during the analyzed period), followed closely by the 20:00 and 22:00 windows.
• Days of the Week: Wednesday is the peak sales day (over 196,000 orders), while the combined weekend (Saturday and Sunday) represents only 24.4% of total volume, with Saturday being the weakest day of the week.

4. Decision Time: Practical Books Are Bought Instantly, Fiction Takes "Research"

The median decision time (from the last click to order completion) is 7.5 minutes. However, behind this figure lie two completely different buyer personas:

1. The Fast Buyer (59% of total): completes the order in less than 30 minutes. These users have a lower cart value (€14.21) and buy an average of 2.69 products.
2. The Patient Buyer (41% of total): delays the decision from a few hours to over a week. Those who delay buy more: customers who return to their cart after more than an hour spend an average of €24.01 (a 58% increase in value) and add 4.25 products to their cart.

What do they buy based on their level of urgency?

• Functional books (textbooks, workbooks, children's activity books) have a rapid conversion rate. The share of school-related books drops from 5.8% in the first 30 minutes after a click to just 3.4% for decisions delayed by over a week.
• Fiction is selected with patience: its share rises from 85.5% in quick purchases to 90.6% for decisions taking longer than 7 days.

5. Traffic Source Footprints: How Traffic Channels Impact Buyer Behavior

Each traffic source brings in users with vastly different behaviors and budgets:

• Cashback and Loyalty: Generates the largest average cart (€26.55) and the shortest decision time (5.9 minutes). Only 5.8% of these users delay their order for more than 24 hours. This is a transaction validation channel, not a discovery channel.
• Social Media and Creators: This channel brings in the cheapest products but in high quantities (3.77 products per order, the highest volume of titles in the ecosystem), with a median value of €14.49. Over 93.3% of these buyers order from mobile devices, and 37.8% shop in the evening (19:00 - 24:00).
• Content and Reviews: This is the only channel dedicated to research. The median decision time is the longest (16.1 minutes), and 40.7% of orders are finalized more than 24 hours after reading a review.
• Aggregators and Comparators: Remain the strongholds of desktop shopping. Only 51.6% of traffic comes from mobile here, indicating that price comparison and offer evaluation are still performed on larger screens.

6. Active Catalog: The Extreme Long-Tail of the Book Market

Out of the 450,623 unique products identified as sold at least once during the analyzed period, sales dynamics reveal an extremely fragmented distribution model:

• 57.21% of products were sold only once during the 31-month span.
• Only 0.1% of the catalog (representing 110 products) managed to surpass the 1,000 sales milestone.

The top best-selling titles (excluding publisher exclusives) are led by:

1. Cât timp înfloresc lămâii (3,866 orders, distributed across 9 stores)
2. Atomic Habits (2,882 orders, distributed across 10 stores)
3. Revoluția glucozei (2,479 orders, distributed across 10 stores)

The most widely distributed titles nationwide belong to the classic domain, free of exclusive publishing rights: The Little Prince (sold in 15 distinct stores), The Wonderful Wizard of Oz (13 stores), and The Adventures of Tom Sawyer (12 stores).

E-commerce Takeaways: How to Leverage This Data

If you own or promote an online bookstore, these figures point to three clear optimization strategies:

1. Mobile-First, But Android-Optimized: Although Mac/iOS users yield larger carts, the bulk of volume comes from Android. The checkout process on Android-mobile must be flawless and ultra-fast.
2. Encourage Bundling: Only 41% of shoppers buy a single book. Creating thematic bundles or promotions like "buy 3 books and get free shipping" aligns perfectly with the online book buyer's natural shopping behavior.
3. Be Patient with Fiction, but Re-market Aggressively for Practical Books: If a user is looking for a textbook or self-help book, they need to be converted quickly (e.g., using "limited stock" offers). If they are browsing fiction, give them time, offer high-quality reviews via content channels, and run retargeting campaigns to remind them of their abandoned cart, knowing their purchasing decision is longer, more mature, and ultimately more valuable.

Read the full report right here: