> ## Documentation Index > Fetch the complete documentation index at: https://course.pokesignal.io/llms.txt > Use this file to discover all available pages before exploring further. # 3.1 ยท The Four Product Classes: Singles, Sealed, Bulk, Slabs > Compare how four kinds of inventory consume cash, labor, knowledge, and time before they sell. Put a raw single, a sealed box, a thousand-card bulk lot, and a graded card on the same workbench. All four can be inventory. What must happen before each becomes cash is very different. The economic engine from Part 2 still applies: expected sale proceeds must cover the purchase and every cost of completing the sale. The product class changes the shape of that equation. Some classes concentrate cash in a few items. Some exchange very little cash for a great deal of handling. Some are easy to list but difficult to sell at the moment you need liquidity. ## The comparison dimensions Use the same questions for each class: * **Cash intensity:** How much business capital is tied up in each unit or batch? * **Labor intensity:** How much sorting, evaluation, listing, storage, and fulfillment sits between purchase and sale? * **Liquidity:** Can part of the position sell easily, or does cash return in large, uneven chunks? * **Knowledge burden:** Which mistakes are most likely when identifying, conditioning, pricing, or choosing the item? * **Risk to test:** Under your price, capacity, and buyer pool, what could turn an apparently good purchase into stuck capital or unpaid work? The goal here is comparison, not selection. ## Singles: flexible cash, repeated decisions Singles are individual, ungraded cards. They let you distribute business capital across many prices and sell part of a collection without waiting for one large buyer. That granularity can make cash return steadily when the cards are desirable and priced for the venue. The trade is labor. Each card needs an exact identity, a condition call, a price, a listing, a storage location, and a correct pick when it sells. The work repeats even when the card is inexpensive. A pile of raw cards therefore has two values: what the cards might sell for and what the operation has enough time to process. Condition and variant knowledge both matter. An optimistic condition call can create a return or damage trust; an overlooked printing can produce the wrong price. An invisible backlog is the danger: cash has been spent, but the cards remain unsorted or unlisted and cannot yet reach a buyer. ## Sealed: less handling, more concentration Sealed inventory includes unopened boxes, tins, cases, and similar products. A repeated item can often be listed and located with far less per-unit work than the equivalent value in raw cards. There is no card-by-card condition decision, although box and case condition still affect what a buyer will accept. The easier processing comes with concentrated capital. A small number of products can hold a large share of the inventory allocation, and demand can vary sharply by product and price. When a popular item is liquid, the operation can turn meaningful cash with little listing work. When demand thins, the same simplicity becomes a locked position: the box cannot be divided and sold one card at a time without becoming a different business model. The knowledge burden is product demand, release supply, reprint exposure, and physical condition. Capital lockup is the danger here, made worse by storage damage or by treating operating inventory as a long-term hold after it stops selling. ## Bulk: low purchase cost, high labor cost Bulk is a large quantity of low-value cards. It can put thousands of real cards through a new seller's hands without committing much cash. That repetition can develop set recognition, sorting, and listing routines, which makes bulk useful when time is available and capital is scarce. The purchase price is only the visible cost. Bulk must be moved, sorted, stored, listed in enough depth to attract orders, found again, and packed. Small errors or wasted motions repeat across hundreds or thousands of cards. The percentage return on a cheap lot may look impressive while the return for an hour of work remains poor. Liquidity depends less on owning a few good cards than on having enough useful inventory processed and available. The cheap purchase becomes expensive when the business accepts cards faster than it can turn them into searchable, saleable stock. ## Slabs: completed grading, narrower spreads A slab is a card already authenticated, graded, and sealed by a grading company. The label turns one part of the condition decision into a standardized description. You still need to identify the exact card, price that card and grade, and understand who buys the label. It does not remove the knowledge burden. Price and liquidity depend on the card, grade, grading label, buyer pool, and current gap between what buyers will pay and what sellers will accept. A slab can be easy to describe and still take time to sell. The decision comes down to whether that gap can absorb selling costs and the buyer pool fits the required sale time. Buying raw cards to grade is a separate operation from reselling finished slabs. It adds an uncertain grade and a period in which the card cannot be sold. Evaluate that path separately, using the grading company's current service terms and realistic outcomes rather than the finished-slab profile above. ## The compact comparison | Class | Cash and liquidity | Labor and knowledge | Risk to test | | ------- | --------------------------------------------------------------------- | ------------------------------------------------------- | ------------------------------------------- | | Singles | Granular positions; cash can return one card at a time | High repeated work; exact printing and condition matter | Unlisted backlog or condition errors | | Sealed | Concentrated positions; liquidity is product- and price-dependent | Low listing work; demand and box condition matter | Capital lockup and storage damage | | Bulk | Low cash per batch; liquidity appears only after processing depth | Very high sorting, storage, and picking work | Labor consumed faster than value is created | | Slabs | Varies by card and grade; resale can be lumpy and price-gap-sensitive | Exact card, grade, label, and buyer pool matter | Too little room after costs or a slow sale | No class is inherently the beginner class or the professional class. Each consumes a different combination of money, time, space, and judgment. Carry this comparison into [Chapter 3.2](/chapters/3-2-matching-class-to-capital), where you will eliminate the classes that violate a hard constraint and write an inventory thesis for the one that best fits the operation you can realistically run now.