For most purposes, it is adequate to generalise the performance as:
The FTSE 100 index fell 40 points on 23 November.This ignores the hour-by-hour changes but gives an overall picture.
Structure
Generalisations can be made in two ways:
(a) Most commonly using the plural:
Joint stock companies began in the sixteenth century.(b) Using the singular + definite article (more formal):
The joint stock company began in the sixteenth century.
Avoid absolute phrases in generalisations such as:Small companies adapt faster to changing markets.
Instead, it is better to use cautious phrases such as:Small companies tend to adapt faster to changing markets.See Unit 2.13 Style (6 Caution)
Write generalisations on the following topics.
(a) market research/new products
Example: Market research can be vital for evaluating new products.(b) job satisfaction/rate of pay
_______________________________________________________________________________(c) weak currency/level of exports
_______________________________________________________________________________(d) spending on R&D/introduction of new products
_______________________________________________________________________________(e) unemployment/level of consumer spending
_______________________________________________________________________________(f) cold weather/demand for gas
_______________________________________________________________________________2.8:Generalisations 121