I dont see how everyone so far has misunderstood what OP was saying
>imagine you live in USSR
>never experienced capitalism first hand and neither have the people around you
>get shown picture
>try and refute it in such a way that others around you would understand
Its difficult to do but you could start from basic principles and show how the free market could first provide basic goods and services like food and water, then more complex ones, then eventually computers/trains/etc. Once you have done this then you can show how it would be just as efficient if not more than socialism since there is greater incentive to be economically productive.