	March 31,		December 31,
(US$ in millions)	2016		2015
Prepaid commodity purchase contracts (1)	$	236	$	287
Secured advances to suppliers, net (2)	552		521
Unrealized gains on derivative contracts, at fair value	1,473		1,456
Recoverable taxes, net	289		364
Margin deposits	368		467
Marketable securities, at fair value and other short-term investments	344		234
Deferred purchase price receivable, at fair value (3)	80		79
Prepaid expenses	149		132
Other	290		359

Total	$	3,781	$	3,899

(1)

Prepaid commodity purchase contracts represent advance payments against fixed price contracts for future delivery of specified quantities of agricultural commodities.

(2)

Bunge provides cash advances to suppliers, primarily Brazilian farmers of soybeans and sugarcane, to finance a portion of the suppliers’ production costs. Bunge does not bear any of the costs or risks associated with the related growing crops. The advances are largely collateralized by future crops and physical assets of the suppliers, carry a local market interest rate and settle when the farmer’s crop is harvested and sold. The secured advances to farmers are reported net of allowances of $2 million at March 31, 2016 and December 31, 2015.

Interest earned on secured advances to suppliers of $11 million for each of the three months ended March 31, 2016 and 2015 is included in net sales in the condensed consolidated statements of income.

(3)

Deferred purchase price receivable represents additional credit support for the investment conduits in Bunge’s accounts receivables sales program (see Note 12).