3 July 2026
Breadth on a quiet day in the cash session
A flat index can hide a wide market or a narrow one. The quiet days are where a simple participation count earns its keep.
The KOSPI cash session runs from 09:00 to 15:30. Some of those days feel like nothing. The index drifts, headlines are thin, and market sentiment in the room is drowsy rather than fearful or eager. Students skip the journal on those days and then lack a comparison when a loud day arrives.
Breadth, as we write it, is a plain count: of the names you actually follow, how many closed up, how many closed down, and whether the index move was carried by one or two of them. You do not need the whole market. You need the list you already have the patience to check. Twelve names is enough. Forty names you will abandon by Wednesday is not.
A quiet index with most of your list up is a different technical context from a quiet index held aloft by a single heavy name. The first can be boring and broad. The second can be boring and fragile. The sentiment sentence for both days might be the same word, quiet. The structure is not the same, which is why the sentence and the count live in different columns.
Han gives this exercise in week five, after people have survived the volume evening and are less likely to decorate the count. Write the numbers before you pick an adjective. If you pick the adjective first, the count starts cooperating with your mood.
Keep the list stable for a month. Changing the names every time a new story appears will make the quiet days impossible to compare, and the quiet days are the baseline the loud ones need.