9. Other Income

The components of other income for the years ended December 31, 2018, 2017, and 2016 were:



	Year-Ended December 31,
	2018		2017		2016
	(in millions)
Market data fees1	$	46	$	39	$	35
Risk exposure fees1		26		24		19
Payments for order flow1		21		15		14
Minimum activity fees1		23		20		18
Other brokerage related fees		25		13		10
Gains on financial instruments, at fair value and other investments, net		24		1		35
Gains (losses) from currency diversification strategy, net		(19)		110		(40)
Other, net		12		110		3
	$	158	$	332	$	94

(1)

See Note 8 for description of these revenues.

Other brokerage related fees include FDIC sweep fees, order routing fees, IPO concession fees and other miscellaneous fees charged to our customers. Gains on financial instruments, at fair value and other investments, net include (1) realized and unrealized gains and losses on financial instruments that (a) are held for purposes other than the Company’s market making activities, (b) are subject to restrictions, or (c) are accounted for under the equity method and (2) dividends on investments accounted at cost less impairment. For the year ended December 31, 2017, other, net includes a gain on the sale of the Company’s U.S. options market making operations to Two Sigma Securities, LLC of $11 million, reflecting the recovery of exit costs, and a $93 million gain from the remeasurement of the Tax Receivable Agreement liability as a result of the Tax Act (see Note 4 and Note 11).