In varies by country, use, and purpose.
In Egypt for example, only declared $10000 US dollars is allowed for a passenger entering the country.
You are allowed to bring as much cash as you would like to carry into the United States, but any amount over 10,000 dollars must be declared. You can keep as much cash as you would like in your home.
You are usually allowed to travel with $800 in cash in Barbados.
300000000000
Cash is private property, there is no limit to how much a person is allowed to carry. If large amounts of cash are found during a routine check by customs or the police, you may be asked why you're carrying though and your criminal background may be checked, which is the same in many other countries of Europe and the world.
If you enter or leave the EU with €10,000 or more in cash (or the equivalent in other currencies or travelers cheques, etc.) you must declare this under current EU customs regulations at your European point of entrance or exit. See the related link for more information
The minimum cash back allowed is $20, and the maximum is $100.
Amounts of more than AUD10,000 in cash (not traveler's cheques or bank drafts) must be reported to Australian Customs when carried into or out of Australia.
According to the TSA, you can travel with any amount of cash legally. If you travel with more than $10,000 however, you must declare it to customs.
As much as you like but any amount over 10,000 NZD (about US $6500) must be declared to customs or face potential confiscation of the money.
You can transfer any amount you like from one account to the other - you're only limited to physically carrying cash through customs. It's the same in most countries - electronic transfers create a 'paper trail' so the cash can be traced to its source. Carrying large amounts of cash without proof of its origin - will get you interrogated !
There are many functions of cash management such as allocating funds to certain charities. Knowing and managing your money can tell you how much you are allowed to spend on a certain purpose.
From the UK outbound, £10.000 cash. no more unlesss you have authorised documents from customs