What happens when no single activity reaches half of value added?

When no single activity accounts for more than half of value added, the classification of a unit depends on how many activities and classes are involved. Paragraphs 79 and 80 of the introductory guidelines draw the line. Two activities always produce a majority, except in the unlikely equal case. More than two activities, with none over half, require the top down method. The rule is statistical only, and it does not determine a code for a specific reader.

What happens with two activities?

Paragraph 79 states the two activity case directly. If a unit performs activities falling in only two different classes, there will always be one activity that accounts for more than 50 percent of value added, except in the highly unlikely case that both activities in the different classes have equal shares, both 50 percent. The activity that represents more than 50 percent of value added is the principal activity and determines the classification of the principal activity of the unit. The rule needs no staged comparison, because the majority is direct. The equal shares case is named as highly unlikely, and the manual does not state a tie break rule in paragraph 79. A reader should not invent one. The institute or register that holds the record resolves an equal case on the unit’s data and the explanatory notes.

The two activity rule assumes the activities fall in different classes. If two activities fall in the same class, they are not two competing claims for the classifying code at class level, because the class is the same. The question then moves to the higher levels only if the activities sit in different groups, divisions or sections. The manual states the rule in class terms, and the hierarchy compatibility requirement in the glossary governs the levels above. A unit with two activities in one class therefore has a straightforward principal activity at class level, whatever the split between the activities inside the class.

What happens with more than two activities?

Paragraph 80 states the complex case. Where a unit performs more than two activities falling into more than two different classes, with none of them accounting for more than 50 percent of value added, the activity classification of that unit must be determined by using the top down method, as described in paragraphs 87 to 89. The word must matters. The top down method is not an option in this case. It is the required rule. The method works down the hierarchy, section, division, group, class, choosing the largest share at each level inside the category chosen at the level above, so that the final class is consistent with every higher level.

The worked example in paragraph 88, covered in a separate guide, shows why the requirement matters. The largest single class in that example holds 28 percent, but the correct principal activity class is a different class holding 23 percent, because its section holds the largest share overall. A direct search for the largest class would give the wrong answer under the manual. The top down method exists to prevent that error. The same logic applies whenever no activity reaches half: the largest class alone cannot be trusted, and the staged comparison must be used instead.

How do the two cases compare?

| Case | Number of classes | Majority present? | Rule the manual states |

|---|---|

| Two activities, unequal shares | Two | Yes, one activity over 50 percent | Majority activity is principal |

| Two activities, equal shares | Two | No, both 50 percent | Highly unlikely, no tie break stated in paragraph 79 |

| More than two activities | More than two | No activity over 50 percent | Top down method required, paragraphs 87 to 89 |

| More than two activities | More than two | Yes, one activity over 50 percent | Majority activity is principal, top down method not required on that ground |

The table follows paragraphs 79 and 80. The fourth row is the ordinary majority case applied to a diversified unit: if one activity does reach more than half, the majority rule answers the question without staging. The third row is the only row that requires the top down method. The distinction is therefore not between simple and diversified units in general. It is between units with a majority activity and units without one, among those with more than two classes.

What does this classification not decide?

The limit matters because the same activity words appear in many different registers and forms. The classification gives the activity a statistical place. It does not give the unit a right, a rate or a status. Eurostat states the legislation applies only to the use of the classification for statistical purposes, and does not oblige member states to collect, publish or supply data. A principal activity label therefore cannot be quoted as proof of eligibility for a scheme, a licence or an agreement. The institute or register named at the end of this guide is where the separate step of confirming a specific unit entry is taken.

Where is the entry confirmed?

Start from the manual paragraphs in the sources, move to the explanatory note for the category in question, and end with the institute or register that holds the entry. Each step answers a different question, and the last step is the only one that answers a question about a specific unit.

Count the classes, check for a majority share, use the top down method only where no majority exists, and confirm the entry with the institute or register that holds it.