Final answer:
The 'masterstroke' in Jones' writing, according to Cialdini, is when he emphasizes the significance of the essay and uses techniques like strong contrast and linkage to enhance its impact and effectiveness.
Step-by-step explanation:
According to Cialdini, Jones' 'masterstroke' in his writing is when he strengthens his argument by calling the essay one of the most famous works ever written. This technique of emphasizing the significance of the work helps to make the analysis more powerful.
Another example of Jones' 'masterstroke' is his use of strong contrast and linkage through phrases like 'instead of protesting' at the start of his sentence. These techniques enhance the impact and effectiveness of Jones' writing.