The audience for this poster was the people of Austria-Hungary. This poster was used as propaganda because it was for a war bond. A war bond is "debt security" issued by the government which helps them by letting them borrow money from the people during a time of war. This was most likely published by a pro-war company or a company that was working for the Austria-Hungary government. The poster is showing a woman representing Austria-Hungary (has the Austria-Hungary flag), holding a gold flag. The gold flag can symbolize the dominance of Austria-Hungary or how they will succeed if the audience were to give them bonds. I think it was effective to some people because it let them know that their country (Austria-Hungary) was very powerful and could succeed with the help of the people. The olive crown that the women wears represented victory and a sense of superiority in Greece, and so you can infer that Austria-Hungary was confident that they were going to win and had a strong nationalism, believed that they were better that everyone else.
This propaganda poster was created in 1916, the translation of this poster says "And you? Subscribe to the 7th War Loan" which was war bonds issued to the country so that it had money to finance the war and help its allies. It also allowed its people to have money and be able to buy goods that would benefit Austria Hungary. Specifically, this image wants to persuade the citizens of Austria Hungary to support its country to look for War Bonds that will help them continue with war during the economic crises that they were facing. The overall goal was to achieve support so that the country was confident enough to look for bonds with other countries. by asking "and you?" it makes the audience feel as if they weren't helping/supporting their country. This propaganda really influenced people because it makes them look at the soldier and make them feel sad to see that they're sacrificing their lives for them. The yellow background stands out, and the color represents wealth and money, which gets the idea across, showing they're after wealth and prosperity in the war. The soldiers face looks sad, sick, stressed, which the people see and makes them want to help them, and the best way to do that is to support the propaganda's goal.