What advantages does a partnership have over a sole proprietorship

Firstly, your partners and you can share the workload. If your partner happens to be an Accountant and you have some business-law skills, both of you can share your expertise. 

Secondly, raising capital is easier than raising oneself (Sole Proprietorship, which you're alone). 

And I totally disagree with the other guy's answer about limited liability. Because there are 2-types of partnership - General and Limited Partnership. 

In limited partnership, it's like what the other guy said - you will lose what you have plough into the business. But for general partnership, you will have unlimited liabilities - you will lose and will be in deep debts, which would resort you to sell your private property (like your house, etc) to pay up the debts, just like Sole Proprietorship. 

And in Limited Partnership, you need at least one GENERAL partner who will be liable for all debts personally. 

The answer would be advertising.