How does flash output vector input?

I'm somewhat of a noob here, so please forgive my ignorance. I tried to google the answer to my questions, but probably not using the right terms.
So my questions are these:
- Is there any advantage to using vector elements in flash projects, or do they just get rasterized in the swf creation process?
- If you use vector instead of raster art, can you scale your swf infinitely large (theoretically) without degradation?
- Will vector art result in a smaller swf size? Will it take less processing power to play?
Thanks!

1. Vector graphics are generally the best option you have in a flash movie and keep your swf very low in file size thus faster loading in browser. They do not get rasterized when published into a swf file.
2. Yes, vector graphics can be scaled infinitely without degradation as they are not resolution dependent.
3. Generally file sizes of swf are low when using simple vector graphics but it really depends on the complexity of the vector graphics. Flash uses mathematical equations of lines and curves to reconstruct the graphic as it is rescaled. So size and processing speed would largely depend on how complex your vector graphics are made. If you have graphics with alot of curves, corners, lines, etc, your file size will increase as you need more bytes for functions ( f(x) ) to reconstruct the graphic, consequently, more processing time/power is required. There are times raster (bitmap) graphics are a better alternative over vector graphics and there are times when you it is better to convert your bitmap graphic to vector (Modify -> Trace Bitmap) when it only uses a few colors and curves/corners. You will need to experiment and find which works better for you.

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