contestada

Are the most reliable indicator of what the public is thinking, and a whole industry and science have grown up around measuring opinion on everything from presidents to toothpaste.

Respuesta :

The answer to this is "the polls", on in other words "surveys of public opinion". 

The polls can for example look as follows: 

51% of people prefer blue to red, and 49% prefer red to blue - this can for example inform toothpaste companies how to design their packaging. 

Polls also help predict the result of political elections. 
Phenomenology

Surveys of public opinion or polls are the most reliable indicator of what the public is thinking, and a whole industry and science have grown up around measuring opinion on everything from presidents to toothpaste.