How is photography changed in terms of subject matter over the past 100 years or so, do you think photographers are testing boundaries more, or do you think it's because society has changed its boundaries?

it has changed because it has became more influential. and also societly has changed its boundaries to allow more

Explanation:

answer; /// the answer to the above question is (true);

there is not really a certain expensive film type but i believe all of them cost mostly the same price, i hope this a little bit